什么是聚合反应中的加聚和缩聚？
What are addition and condensation polymerization?
加聚是含不饱和键的单体直接相连成大分子，不放出小分子，如聚乙烯。缩聚是单体间脱去水或其他小分子形成聚合物，如尼龙和聚酯。
Addition polymerization links monomers with unsaturated bonds into large molecules without releasing small molecules, as in polyethylene. Condensation polymerization joins monomers while shedding water or another small molecule, as in nylon and polyester.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#加聚 #缩聚 #聚合物
E1和E2消除反应在机理上有什么区别？
What mechanistic difference distinguishes E1 and E2 elimination?
E2是一步双分子消除：碱同时夺取beta-氢并促使离去基团离开，两者必须处于反式共平面位置，产物是反式消除的烯烃，速率与底物和碱的浓度都成正比。E1先解离成碳正离子，再由碱夺取beta-氢，分两步经过碳正离子中间体，速率只与底物有关，常与SN1竞争，并可能发生碳正离子重排。
E2 is a one-step bimolecular elimination: the base abstracts a beta-hydrogen while the leaving group departs simultaneously, and the two must be anti-periplanar, giving anti elimination; the rate depends on both substrate and base. E1 first ionizes to a carbocation and then a base removes a beta-hydrogen, proceeding in two steps through a carbocation intermediate; its rate depends only on the substrate, it often competes with SN1, and the cation may undergo rearrangement.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#消除反应 #E1 #E2
什么是逆合成分析？它的基本思路是什么？
What is retrosynthetic analysis, and what is its basic idea?
逆合成分析由诺贝尔化学奖得主科里提出：从目标分子出发，通过识别官能团转化、断键和重排，反向拆解成更简单的前体，逐步简化直到得到市售的廉价原料。逆向推导出的合成路线还要正向逐一验证每步反应的可行性、区域和立体选择性以及产率。
Retrosynthetic analysis, introduced by Nobel laureate E. J. Corey, works backward from the target molecule: by recognizing functional-group interconversions, bond disconnections and rearrangements, the molecule is progressively simplified into easier precursors until cheap commercial starting materials are reached. The reverse route is then validated forward, checking each step for feasibility, regio- and stereoselectivity, and yield.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#逆合成 #有机合成 #Corey
苯环为什么特别稳定？
Why is the benzene ring especially stable?
苯（C₆H₆）的六个碳原子形成平面环，六个 π 电子离域在整个环上，满足休克尔 4n+2 规则（n=1）。这种离域降低了分子能量，使苯不易发生加成而倾向于取代反应。芳香性正是这种特殊稳定性的来源。
In benzene (C₆H₆) the six carbons form a planar ring with six π electrons delocalized over the whole ring, satisfying Hückel's 4n+2 rule (n=1). This delocalization lowers the energy, so benzene resists addition and favors substitution. Aromaticity is the source of this special stability.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#芳香性 #苯 #休克尔规则
什么是苯环和芳香族化合物？
What are benzene rings and aromatic compounds?
芳香族化合物含有苯环这样特殊的稳定环状结构，其中六个碳原子由离域电子连接。苯是最简单的芳香烃，广泛用于合成染料和药物。
Aromatic compounds contain special stable ring structures like the benzene ring, where six carbon atoms are joined by delocalized electrons. Benzene is the simplest aromatic hydrocarbon and is widely used to make dyes and medicines.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#苯环 #芳香族 #离域
加聚反应和缩聚反应有什么本质区别？为什么尼龙和涤纶是缩聚产物？
What is the fundamental difference between addition and condensation polymerization, and why are nylon and polyester condensation products?
加聚是单体打开双键直接串联，产物只有高分子，原子利用率百分之百，如聚乙烯、聚丙烯；缩聚则是带两个官能团的单体之间脱去小分子（如水）而连接，产物是高分子加小分子。尼龙66由己二酸与己二胺缩水成酰胺键生成，涤纶由对苯二甲酸与乙二醇酯化缩聚而成，每个连接都脱去一分子水，所以它们都是缩聚产物。由于缩聚要求单体官能团接近等摩尔且反应程度很高，工业化控制比加聚更讲究。
In addition polymerization monomers simply open their double bonds and link up, so the only product is the polymer, with 100% atom economy - as in polyethylene or polypropylene. In condensation polymerization monomers carrying two functional groups join by splitting off a small molecule such as water, so the products are the polymer plus small molecules. Nylon-66 forms amide bonds when hexanedioic acid and hexamethylenediamine condense, and polyester forms by esterifying terephthalic acid with ethylene glycol - every link releases one water molecule, so both are condensation polymers. Because condensation needs near-equal stoichiometry of the two monomers and near-complete conversion, industrial control is trickier than for addition polymerization.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#加聚 #缩聚 #尼龙
什么是“芳香性”？休克尔规则（Hückel's rule）如何判断一个环状分子是否具有芳香性？
What is 'aromaticity,' and how does Hückel's rule determine whether a cyclic molecule is aromatic?
芳香性指平面、环状、完全共轭且含有4n+2个π电子的分子所表现出的特殊稳定性。根据休克尔规则，满足“平面+环状+连续共轭+π电子数为4n+2（n=0,1,2…）”的分子具有芳香性，例如苯有6个π电子（n=1）而稳定。
Aromaticity is the special stability shown by planar, cyclic, fully conjugated molecules that contain 4n+2 π electrons. By Hückel's rule, a molecule is aromatic if it is planar, cyclic, continuously conjugated, and has a 4n+2 count of π electrons (n = 0,1,2…); benzene, with 6 π electrons (n=1), is the classic example.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03
来源 · Source
邢其毅、裴坚《基础有机化学》（第四版），北京大学出版社；E. Hückel,1931
Xing Qiyi & Pei Jian, 'Fundamentals of Organic Chemistry' (4th ed.), Peking University Press; E. Hückel, 1931
#芳香性 #休克尔规则 #苯 #共轭 #π电子
Diels-Alder 反应为什么被称为“[4+2]环加成”？
Why is the Diels-Alder reaction called a '[4+2] cycloaddition'?
共轭二烯（4 个π电子）与亲双烯体（2 个π电子）协同成环给出六元环，电子转移一步完成且不产生中间体，是经典的周环反应。Diels 与 Alder 在 1928 年发现并获 1950 年诺奖。
A conjugated diene (4 π electrons) and a dienophile (2 π electrons) join in one concerted step to a six-membered ring with no intermediate—a classic pericyclic reaction. Diels and Alder discovered it in 1928 (Nobel 1950).
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
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Diels 与 Alder 1928 年论文；Clayden《有机化学》
Diels & Alder (1928); Clayden, Organic Chemistry
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL16667558W：Organic chemistry（首版 2
#Diels-Alder #周环反应 #协同
维蒂希（Wittig）反应有什么用？为什么它在有机合成中很重要？
What is the Wittig reaction used for, and why is it important in organic synthesis?
Wittig 反应用磷叶立德与醛/酮反应，专一地把羰基（C=O）转化为烯烃（C=C），并可精确控制双键位置。它避免了传统方法产生的位置异构副产物，是合成维生素 A、天然产物中烯键的常用手段，相关概念获 1979 年诺贝尔化学奖。
The Wittig reaction uses a phosphonium ylide to convert a carbonyl (C=O) into an alkene (C=C) with precise control of the double-bond position. It avoids the positional-isomer byproducts of older methods and is widely used to make alkene linkages in vitamin A and natural products; the underlying chemistry earned the 1979 Nobel Prize.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
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Clayden, Greeves & Warren《有机化学》（第2版），第40章；Wittig & Schöllkopf, Chem. Ber. 1954
Clayden, Greeves & Warren, "Organic Chemistry" (2nd ed.), Ch.40; Wittig & Schöllkopf, Chem. Ber. 1954
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL4102856W：Organic chemistry（首版 19
#Wittig反应 #烯烃合成 #叶立德 #诺贝尔化学奖
阿司匹林（乙酰水杨酸）分子中同时含酯基和羧基，这两个官能团如何解释它的疗效与副作用？
Aspirin (acetylsalicylic acid) contains both an ester group and a carboxyl group. How do these functional groups explain how it works and its side effects?
阿司匹林分子中，酯基由水杨酸的酚羟基被乙酸乙酰化而成，这一修饰降低了游离水杨酸对胃的刺激性并改善了药代性质；进入体内后，酯基被酯酶水解，逐步释放出水杨酸。真正不可逆抑制环氧化酶（COX）的是阿司匹林本身：它把乙酰基共价转移到COX活性中心的丝氨酸残基上，使酶永久失活，从而阻断前列腺素合成，产生退热、镇痛和抗炎作用；游离水杨酸对COX只有较弱且可逆的抑制。但前列腺素减少会削弱胃黏膜的保护层，这正是长期服用易伤胃的原因。羧基使分子呈弱酸性，能与碱成盐（如阿司匹林钠盐）改善水溶性。
In aspirin, the ester group forms when the phenolic hydroxyl of salicylic acid is acetylated by acetic acid; this modification reduces the stomach irritation of free salicylic acid and improves the drug's pharmacokinetics. Once ingested, esterases hydrolyse the ester and release salicylic acid gradually. It is aspirin itself that irreversibly inhibits cyclooxygenase (COX): it transfers its acetyl group covalently to a serine residue in the enzyme's active site, permanently disabling it and blocking prostaglandin synthesis, which brings antipyresis, analgesia and anti-inflammation; free salicylic acid inhibits COX only weakly and reversibly. Fewer prostaglandins, however, weaken the stomach's protective lining - the reason long-term use irritates it. The carboxyl group makes the molecule weakly acidic and lets it form water-soluble salts such as sodium acetylsalicylate.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
Royal Society of Chemistry（阿司匹林）
Royal Society of Chemistry (aspirin)
#阿司匹林 #酯水解 #环氧化酶
SN1和SN2反应在机理、立体化学和速率上有什么不同？
How do SN1 and SN2 differ in mechanism, stereochemistry and rate?
SN2是一步双分子反应：亲核试剂从背面进攻，离去基团从另一侧离开，构型发生翻转（瓦尔登翻转），速率与底物和亲核试剂浓度都成正比，偏爱位阻小的甲基和伯碳底物。SN1分两步：先解离生成平面形碳正离子，再被亲核试剂从两侧进攻，产物发生外消旋化，速率只与底物浓度有关，能形成稳定碳正离子的叔碳底物最易发生。极性溶剂对两者影响也不同。
SN2 is a one-step bimolecular reaction: the nucleophile attacks from the back while the leaving group departs from the other side, inverting the configuration (Walden inversion); the rate depends on both the substrate and the nucleophile, and unhindered methyl and primary substrates react best. SN1 proceeds in two steps: dissociation to a planar carbocation, then nucleophile attack from either face, racemizing the product; the rate depends only on the substrate, and tertiary substrates that form stable carbocations react most readily. Solvent polarity affects the two differently as well.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#SN1 #SN2 #碳正离子
碳正离子的稳定性顺序是什么？为什么是这个顺序？
What is the stability order of carbocations, and why does that order hold?
稳定性顺序为：叔碳正离子大于仲碳正离子大于伯碳正离子大于甲基正离子。烷基通过给电子诱导效应和超共轭效应，把正电荷分散到相邻的C-H或C-C sigma键上，烷基越多、正电荷越分散，越稳定。与双键或苯环共轭也能显著稳定正离子，所以烯丙基和苄基碳正离子格外稳定。
Stability follows: tertiary carbocation > secondary > primary > methyl. Alkyl groups disperse the positive charge through electron-donating inductive effects and hyperconjugation with adjacent C-H or C-C sigma bonds; more alkyl groups mean more charge dispersal and greater stability. Conjugation with double bonds or a benzene ring also stabilizes the cation strongly, so allylic and benzylic carbocations are especially stable.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#碳正离子 #超共轭 #稳定性
狄尔斯—阿尔德反应（Diels-Alder reaction）属于哪一类反应？它有什么突出特点？
What class of reaction is the Diels-Alder reaction, and what are its distinctive features?
狄尔斯—阿尔德反应是一个[4+2]环加成反应，由共轭二烯与亲二烯体在加热条件下一步生成六元环，无需催化剂。它是协同反应，具有立体专一性（顺式加成）和区域选择性，1928年由狄尔斯和阿尔德发现并获1950年诺贝尔化学奖。
The Diels-Alder reaction is a [4+2] cycloaddition in which a conjugated diene and a dienophile combine in one step under heat to form a six-membered ring, with no catalyst required. It is concerted, stereospecific (cis addition), and regioselective; it was discovered by Diels and Alder in 1928 and earned the 1950 Nobel Prize in Chemistry.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03
来源 · Source
诺贝尔奖官方网站（NobelPrize.org，1950年化学奖）；邢其毅《基础有机化学》
NobelPrize.org (Chemistry 1950); Xing Qiyi, 'Fundamentals of Organic Chemistry'
#狄尔斯—阿尔德 #环加成 #协同反应 #二烯 #立体专一性
芳香族化合物为什么特别稳定？
Why are aromatic compounds especially stable?
满足休克尔 4n+2 规则的环状共轭π电子体系具有离域的闭环电子，能量显著低于定域结构，因而稳定且不易加成。Hückel 在 1931 年用量子化学预言了这种特殊稳定性。
A cyclic conjugated π system obeying Hückel's 4n+2 rule has delocalized loop electrons whose energy is markedly lower than a localized structure, making it stable and resistant to addition. Hückel predicted this special stability quantum-chemically in 1931.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Hückel 1931 年论文；Clayden《有机化学》
Hückel (1931); Clayden, Organic Chemistry
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL16667558W：Organic chemistry（首版 2
#芳香性 #休克尔规则 #π离域
石油分馏为什么能把原油分出汽油、煤油和柴油等不同产品？
How does fractional distillation split crude oil into gasoline, kerosene, diesel and other products?
石油是几百种碳氢化合物的混合物，沸点从几十度到几百度不等。分馏塔自下而上温度递减，气化后的油蒸气在塔中上升时，各组分按沸点在不同高度的塔盘上冷凝：沸点最低的汽油组分最先在塔顶凝出，煤油、柴油等随后在中部凝出，重油则留在塔底。分出的馏分仍是混合物，还需催化裂化、重整等进一步加工，才能得到高辛烷值汽油等高附加值产品。
Petroleum is a mixture of hundreds of hydrocarbons whose boiling points span from tens to several hundred degrees Celsius. In a fractionating column the temperature drops from bottom to top; as vapour rises, each compound condenses at the tray matching its boiling point - the low-boiling gasoline fraction condenses first near the top, kerosene and diesel condense lower down, and heavy residue stays at the bottom. Each fraction is still a mixture, so further steps like catalytic cracking and reforming turn them into high-value products such as high-octane gasoline.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#石油 #分馏 #沸点
青霉素是怎样杀菌的？细菌为什么会耐药？
How does penicillin kill bacteria, and why do bacteria become resistant?
青霉素的beta-内酰胺环结构与肽聚糖合成末端的D-Ala-D-Ala片段相似，能不可逆地酰化转肽酶（青霉素结合蛋白PBP），抑制肽聚糖交联，细菌因细胞壁不完整而裂解。耐药菌通过产生beta-内酰胺酶水解青霉素，或突变PBP降低对药物的亲和力来抵抗，因此临床上开发了耐酶青霉素和beta-内酰胺酶抑制剂（如克拉维酸）组合用药。
Penicillin's beta-lactam ring mimics the D-Ala-D-Ala terminus of peptidoglycan synthesis, irreversibly acylating transpeptidases (penicillin-binding proteins, PBPs), blocking cell-wall crosslinking so bacteria lyse. Resistant bacteria produce beta-lactamases that hydrolyze penicillin or mutate PBPs to lower drug affinity; clinically this led to penicillinase-resistant penicillins and combinations with beta-lactamase inhibitors such as clavulanic acid.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
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出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
Nature（青霉素机制与耐药研究）
Nature (penicillin mechanism and resistance); ACS
#药物化学 #beta-内酰胺 #耐药性
马氏规则的内容是什么？现代电子理论怎样解释它？
What does Markovnikov's rule state, and how is it explained by modern electronic theory?
马氏规则：不对称烯烃与卤化氢加成时，氢加到含氢较多的碳上，卤素加到含氢较少的碳上。现代解释基于碳正离子中间体稳定性：质子先进攻双键，形成的碳正离子越稳定越占优势，而烷基取代越多、超共轭越强，正离子越稳定。在过氧化物存在下，HBr按自由基机理加成，得到反马氏产物。
Markovnikov's rule: when HX adds to an unsymmetrical alkene, hydrogen goes to the carbon bearing more hydrogens and halogen to the carbon bearing fewer. The modern explanation rests on carbocation stability: protonation produces a carbocation intermediate, and the more alkyl-substituted cation, stabilized by hyperconjugation and induction, forms preferentially. In the presence of peroxides, HBr adds by a radical mechanism and gives the anti-Markovnikov product.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
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邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#马氏规则 #亲电加成 #过氧化物效应
酯的皂化反应（碱性水解）为什么是不可逆的？它和酸性水解有何不同？
Why is the saponification (base-catalyzed hydrolysis) of an ester irreversible, and how does it differ from acid-catalyzed hydrolysis?
在碱性条件下，酯水解生成的羧酸立即被碱中和成羧酸盐，使逆反应（酯化）无法进行，因此皂化反应进行到底、不可逆。酸性水解是可逆平衡反应，需除去水或使用过量试剂推动平衡，产物为游离羧酸和醇。
Under basic conditions the carboxylic acid produced by ester hydrolysis is immediately neutralized to a carboxylate salt, preventing the reverse esterification, so saponification goes to completion and is irreversible. Acid-catalyzed hydrolysis is an equilibrium process that requires removing water or using excess reagent to drive it toward products, yielding free carboxylic acid and alcohol.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
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邢其毅、裴坚《基础有机化学》（第四版），北京大学出版社
Xing Qiyi & Pei Jian, 'Fundamentals of Organic Chemistry' (4th ed.), Peking University Press
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787301272121（按标识回读: 基础有机化学（第4版）上册）
#皂化 #酯水解 #碱性 #不可逆 #羧酸盐
天然香草味和人工香兰素在化学上有什么区别？
Chemically, how do natural vanilla flavor and synthetic vanillin differ?
香草荚香气的主要成分是香兰素（4-羟基-3-甲氧基苯甲醛），天然香草还含几百种微量化合物，香气更复杂。人工香兰素与天然香兰素是同一个化学结构，可从愈创木酚或木质素制得，并非假成分，只是来源和微量副成分不同，风味因此不完全一致。
The key aroma compound of vanilla pods is vanillin (4-hydroxy-3-methoxybenzaldehyde), and natural vanilla also contains hundreds of minor compounds that make its fragrance more complex. Synthetic vanillin has the same chemical structure, made from guaiacol or lignin - it is not a fake ingredient, but its origin and trace companions differ, so the flavor is not identical.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
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邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#香料化学 #香兰素 #风味
什么是加成聚合？以聚乙烯为例。
What is addition polymerization? Use polyethylene as an example.
加成聚合是小分子单体通过不饱和键（如 C=C）打开并相互连接成大分子，过程中没有小分子副产物。乙烯（CH₂=CH₂）在催化剂和压力下打开双键，连成 –(CH₂–CH₂)–n 长链，即聚乙烯。它是全球产量最大的塑料之一。
Addition polymerization links monomers via their unsaturated bonds (e.g., C=C) into a large molecule without releasing small byproducts. Ethylene (CH₂=CH₂) opens its double bond under catalyst and pressure to form the –(CH₂–CH₂)–n chain of polyethylene. It is one of the world's most produced plastics.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
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潘祖仁《高分子化学》
Polymer Chemistry (Pan Zuren)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787122000248（豆瓣书目条目: 高分子化学）
#加成聚合 #乙烯 #聚乙烯
为什么很多水果闻起来很香，而这些香味大多来自酯类化合物？
Why do many fruits smell sweet and fragrant, and why are those smells usually due to esters?
水果成熟时会生成大量酯类，例如乙酸异戊酯闻起来像香蕉，丁酸乙酯带有菠萝味。酯分子容易挥发，带着香气飘进鼻子，与嗅觉受体结合就被我们闻到。酯是由酸和醇在果实里缩合而成的，不同的酸和醇组合出不同的果香。
Ripening fruits build up large amounts of esters: isoamyl acetate smells like banana and ethyl butyrate carries a pineapple note. Ester molecules are volatile, so they drift into the nose and trigger smell receptors. An ester forms when an acid and an alcohol condense inside the fruit, and different acid-alcohol pairs give different fruity scents.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#酯 #果香 #挥发
什么是同分异构体？
What are isomers?
同分异构体是具有相同分子式但原子连接方式或空间排列不同的化合物。例如正丁烷和异丁烷分子式都是C4H10，但结构不同，性质也有差别。
Isomers are compounds with the same molecular formula but different arrangements of atoms or spatial layouts. For example, n-butane and isobutane both have the formula C4H10 but differ in structure and some properties.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#同分异构体 #结构 #分子式
为什么苯酚（石炭酸）的酸性比普通醇强得多？
Why is phenol (carbolic acid) much more acidic than ordinary alcohols?
苯酚解离出质子后形成的苯氧负离子，其负电荷可通过共振离域到苯环上，从而得到显著稳定。普通醇的烷氧负离子负电荷局限在氧原子上，稳定性差，因此苯酚的pKa约10，远强于乙醇（pKa约16）。
Upon losing a proton, the phenoxide ion stabilizes its negative charge by resonance delocalization onto the benzene ring. In ordinary alcohols the alkoxide charge is localized on the oxygen, making it much less stable; consequently phenol has a pKa around 10, far more acidic than ethanol (pKa ~16).
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
邢其毅、裴坚《基础有机化学》（第四版），北京大学出版社
Xing Qiyi & Pei Jian, 'Fundamentals of Organic Chemistry' (4th ed.), Peking University Press
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787301272121（按标识回读: 基础有机化学（第4版）上册）
#苯酚 #酸性 #共振稳定 #苯氧负离子 #pKa
塑料袋的主要成分是什么？为什么它比纸袋结实却很难在自然界降解？
What is a plastic bag mostly made of, and why is it tougher than a paper bag yet so slow to degrade in nature?
塑料袋主要是聚乙烯，是成千上万乙烯分子连成的高分子长链。长链互相缠结、分子间作用力强，所以比纸结实耐用。但正是这些牢固的碳-碳长链几乎不溶于水、也难被微生物分解，埋在土里几十年都不腐烂，成为白色污染的来源。
Plastic bags are mostly polyethylene: very long chains of linked ethylene units. The chains tangle together with strong intermolecular forces, making the bag tough and durable. But those same sturdy carbon-carbon chains hardly dissolve in water and resist microbial attack, so a bag can sit in soil for decades without rotting - a major source of white pollution.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#塑料 #高分子 #降解
什么是碳氢化合物（烃）？
What are hydrocarbons?
烃是只由碳和氢两种元素组成的有机化合物，是石油和天然气的主要成分。甲烷、汽油中的辛烷都属于烃类。
Hydrocarbons are organic compounds made only of carbon and hydrogen, and they are the main components of petroleum and natural gas. Methane and octane in gasoline are hydrocarbons.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#烃 #碳氢 #石油
什么是酯，为什么水果有香味？
What are esters and why do fruits smell good?
酯是酸和醇反应生成的一类有机物，许多酯带有水果般的香气。香蕉、苹果和菠萝的香味就来自不同的酯类化合物。
Esters are organic compounds formed from acids and alcohols, and many esters have fruity scents. The smells of banana, apple, and pineapple come from different ester compounds.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#酯 #香味 #水果
苯在浓硫酸催化下与浓硝酸反应生成什么？这属于哪一类反应？
What does benzene give with concentrated nitric acid catalyzed by concentrated sulfuric acid, and what class of reaction is this?
苯与浓硝酸在浓硫酸催化下发生硝化反应生成硝基苯。它属于亲电取代反应：浓硫酸使硝酸生成亲电的硝鎓离子（NO2+），进攻苯环形成带正电的中间体，随后脱去一个质子恢复芳香性。苯环还能发生卤代、磺化、烷基化等同类型取代反应。
Benzene reacts with concentrated nitric acid under sulfuric-acid catalysis to give nitrobenzene by nitration. It is an electrophilic aromatic substitution: sulfuric acid converts nitric acid into the electrophilic nitronium ion (NO2+), which attacks the ring, forms a positively charged intermediate, then loses a proton to restore aromaticity. Halogenation, sulfonation and alkylation follow the same substitution pattern.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#亲电取代 #硝化 #苯
葡萄酒开瓶放久了为什么会有醋味？
Why does an open bottle of wine slowly start to taste like vinegar?
空气中的醋酸菌进入酒后，会把乙醇氧化成乙酸，酒就带上了醋味。这本质上是有机化学里的氧化反应：乙醇的羟基先被氧化成醛基，再被氧化成羧基。温度越高、接触空气越多，变酸越快，所以密封冷藏能明显减缓这个过程。
Acetic acid bacteria drifting in from the air oxidize ethanol to acetic acid, and the wine takes on a vinegary taste. This is an oxidation reaction in organic terms: the hydroxyl group of ethanol is oxidized first to an aldehyde and then to a carboxylic acid. Warmth and plenty of air speed it up, which is why sealing and refrigeration slow the souring noticeably.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#乙醇 #氧化 #乙酸
醛和酮在结构上有何不同？
How do aldehydes and ketones differ structurally?
醛的羰基（C=O）碳至少连有一个氢原子，官能团写在碳链末端（–CHO）；酮的羰基碳两侧都连着碳，位于链中。这一位置差异使醛更易被氧化，能与斐林试剂、托伦试剂反应，酮一般不能。两者都可由醇的氧化得到。
An aldehyde's carbonyl carbon is bonded to at least one hydrogen, placing the group at a chain end (–CHO); a ketone's carbonyl carbon is flanked by carbons in the middle. This positional difference makes aldehydes easier to oxidize—they react with Fehling's and Tollens' reagents, unlike most ketones. Both can be obtained by alcohol oxidation.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#醛 #酮 #羰基
为什么油脂放久会“哈喇”（酸败）？
Why do fats go rancid over time?
含不饱和双键的油脂在光照、氧气或水解作用下发生氧化或断裂，产生短链脂肪酸与醛酮等刺激性气味物质。Coultate 在《食物成分化学》中详述了脂类氧化与水解两条酸败路径。
Fats with unsaturated double bonds oxidize or hydrolyze under light, oxygen or moisture, breaking into short-chain fatty acids and aldehydes that smell rancid. Coultate's 'Food: The Chemistry of its Components' details the oxidative and hydrolytic routes.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
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Coultate《食物：成分的化学》；Belitz《食品化学》
Coultate, Food: The Chemistry of its Components; Belitz, Food Chemistry
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL5230785W：Food, the chemistry of
#酸败 #脂质氧化 #水解
甲醇和乙醇都含羟基（-OH），为什么甲醇有毒而乙醇可以饮用？
Both methanol and ethanol contain a hydroxyl group. Why is methanol poisonous while ethanol can be drunk?
毒性不只取决于官能团，还取决于分子被代谢后的产物。乙醇在体内主要被氧化成乙醛和乙酸，能继续分解为二氧化碳和水；而甲醇被醇脱氢酶氧化成甲醛和甲酸，甲酸会在体内积累，损伤视神经和肾脏，少量即可致盲甚至致命。所以误喝工业酒精（含甲醇）极其危险，医用酒精用的是乙醇。
Toxicity depends not just on the functional group but on what the body turns the molecule into. Ethanol is oxidized mainly to acetaldehyde then acetic acid, which breaks down to carbon dioxide and water; methanol, however, is oxidized by alcohol dehydrogenase to formaldehyde and formic acid. Formic acid accumulates and damages the optic nerve and kidneys - small amounts can blind or kill. That is why industrial alcohol containing methanol is extremely dangerous, while medical alcohol is ethanol.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#甲醇 #乙醇 #代谢毒性
酮-烯醇互变异构是什么？
What is keto-enol tautomerism?
某些羰基化合物中，质子在氧与α-碳之间转移，使酮式与烯醇式达成快速平衡，二者互为构造异构体。烯醇式因共轭或分子内氢键而稳定，Clayden 把它列为有机机理的核心概念。
In some carbonyl compounds a proton shuttles between oxygen and the alpha carbon, equilibrating a keto form with an enol form that are constitutional isomers. The enol is stabilized by conjugation or intramolecular hydrogen bonding; Clayden treats this as a core mechanism.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
Clayden《有机化学》
Clayden, Organic Chemistry
#互变异构 #酮式 #烯醇式
在 SN1 亲核取代反应中，碳正离子为什么会发生重排（如 1,2-氢迁移）？
In an SN1 nucleophilic substitution, why does a carbocation undergo rearrangement such as a 1,2-hydride shift?
SN1 先离解生成碳正离子，而更稳定的碳正离子（如从二级变三级）能量更低。当相邻碳上有氢或烷基可迁移时，它会"搬家"到缺电子的碳上，使中间体更稳定，于是产物骨架可能改变。这正是 SN1 与 SN2 产物有时不同的原因之一。
SN1 first generates a carbocation, and a more stable one (e.g., secondary to tertiary) is lower in energy. When an adjacent hydrogen or alkyl group can migrate, it shifts to the electron-deficient carbon, stabilizing the intermediate and possibly changing the carbon skeleton—one reason SN1 products can differ from SN2.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Clayden, Greeves & Warren《有机化学》（第2版），第39章
Clayden, Greeves & Warren, "Organic Chemistry" (2nd ed.), Ch.39
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL16667558W：Organic chemistry（首版 2
#SN1 #碳正离子 #重排 #1,2-氢迁移
有机合成中为什么要使用"保护基"？它是怎样工作的？
Why are "protecting groups" used in organic synthesis, and how do they work?
一个分子常有多个官能团，但某一步只想改造其中一个，保护基就临时"盖住"不想反应的基团，反应完再脱除。例如把醇变成硅醚保护，等别处反应结束后再水解脱保护，从而避免副反应、提高选择性。
A molecule often has several functional groups, but a given step may need to modify just one; a protecting group temporarily "covers" the unreactive site and is removed afterward. For example, an alcohol is converted to a silyl ether for protection, then deprotected by hydrolysis once the other transformation is done, avoiding side reactions.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Greene & Wuts《有机合成中的保护基》（Protective Groups in Organic Synthesis，第4版）
Greene & Wuts, "Protective Groups in Organic Synthesis" (4th ed.)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787562844464（豆瓣书目条目: 有机合成中的保护基）
#保护基 #官能团 #有机合成 #选择性
乙醇、乙醛、乙酸和乙酸乙酯都只含碳、氢、氧三种元素，为什么它们的性质差别那么大？
Ethanol, acetaldehyde, acetic acid and ethyl acetate all contain only carbon, hydrogen and oxygen. Why are their properties so different?
它们携带的官能团不同：乙醇带羟基（-OH），乙醛带醛基（-CHO），乙酸带羧基（-COOH），乙酸乙酯带酯基（-COOR）。有机分子的化学性质几乎全部由官能团决定，碳骨架只提供基本框架。所以含羟基的乙醇易被氧化成乙醛，含羧基的乙酸显酸性，而酯基则带来水果香气的特征。
They carry different functional groups: ethanol has a hydroxyl group (-OH), acetaldehyde an aldehyde group (-CHO), acetic acid a carboxyl group (-COOH), and ethyl acetate an ester group (-COOR). In organic chemistry the functional group decides almost all chemical behaviour, while the carbon skeleton is just the framework. That is why ethanol is readily oxidized to acetaldehyde, the -COOH group makes acetic acid acidic, and ester groups produce fruity aromas.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
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邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#官能团 #羟基 #羧基
格氏试剂在有机合成中有什么用？
What are Grignard reagents used for in synthesis?
格氏试剂（RMgX）提供强亲核的碳负离子等价物，可与醛、酮、酯加成构建新的碳-碳键，是制备醇类的关键工具。Grignard 于 1900 年发现并在 1912 年获诺贝尔奖。
A Grignard reagent (RMgX) supplies a strongly nucleophilic carbon equivalent that adds to aldehydes, ketones and esters to build new carbon-carbon bonds, a key route to alcohols. Grignard discovered it in 1900 and won the 1912 Nobel Prize.
难度 进阶 · 适合 初中(12-15)
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Grignard 1900 年论文；Clayden《有机化学》
Grignard (1900); Clayden, Organic Chemistry
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#格氏试剂 #碳碳键 #亲核加成
什么是手性分子？为什么它很重要？
What is a chiral molecule and why does it matter?
手性分子与其镜像不能重合，就像左手和右手的关系，通常源于连有四个不同基团的碳原子（手性中心）。许多药物的手性对映体生理活性差异巨大，例如一种沙利度胺对映体镇静、另一种致畸。因此药物研发必须区分对映体。
A chiral molecule is not superimposable on its mirror image, like left and right hands, often due to a carbon attached to four different groups (a stereocenter). Many drug enantiomers differ greatly in biological activity—one thalidomide enantiomer sedated, the other caused birth defects. Distinguishing enantiomers is thus essential in drug development.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
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邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#手性 #对映体 #沙利度胺
什么是官能团？
What is a functional group?
官能团是决定有机物化学性质的原子或原子团，如羟基、羧基、氨基等。含有相同官能团的化合物往往表现出相似的化学性质。
A functional group is an atom or group of atoms that determines the chemical properties of an organic compound, such as hydroxyl, carboxyl, and amino groups. Compounds with the same functional group often show similar chemistry.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
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邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#官能团 #羟基 #羧基
格氏试剂（Grignard reagent）在有机合成中有什么用途？使用它时为什么要保持无水无氧？
What is the Grignard reagent used for in organic synthesis, and why must it be handled under anhydrous, oxygen-free conditions?
格氏试剂（RMgX）是强亲核试剂，可与醛、酮、酯等羰基化合物加成，是构建碳—碳键、合成醇类的重要工具。它极易与水反应生成烷烃（RMgX + H2O → RH + MgXOH），也易被氧气氧化，因此必须在严格无水无氧环境下制备和使用。
Grignard reagents (RMgX) are strong nucleophiles that add to carbonyl compounds such as aldehydes, ketones, and esters, making them essential for forming carbon-carbon bonds and synthesizing alcohols. They react violently with water to give alkanes (RMgX + H2O → RH + MgXOH) and are readily oxidized by air, so they must be prepared and used under strictly anhydrous, oxygen-free conditions.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03
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诺贝尔奖官方网站（NobelPrize.org，1912年化学奖）；邢其毅《基础有机化学》
NobelPrize.org (Chemistry 1912); Xing Qiyi, 'Fundamentals of Organic Chemistry'
#格氏试剂 #亲核加成 #碳碳键 #羰基 #无水
什么是手性分子？为什么一对对映异构体的左右旋光方向相反但其他物理性质相同？
What is a chiral molecule, and why do a pair of enantiomers rotate plane-polarized light in opposite directions while sharing the same physical properties?
手性分子与其镜像不能重合，如同左手与右手，通常因含一个连有四个不同基团的碳原子（手性中心）而产生。一对对映异构体除使偏振光旋转方向相反（一个左旋、一个右旋）外，熔点、沸点等物理性质完全相同，仅在手性环境（如偏振光、手性酶）中表现不同。
A chiral molecule is non-superimposable on its mirror image, like left and right hands, usually arising from a carbon attached to four different groups (a stereocenter). A pair of enantiomers differ only in the direction they rotate plane-polarized light (one levorotatory, one dextrorotatory); their melting points, boiling points, and other physical properties are identical except in chiral environments such as polarized light or chiral enzymes.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
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邢其毅、裴坚《基础有机化学》（第四版），北京大学出版社
Xing Qiyi & Pei Jian, 'Fundamentals of Organic Chemistry' (4th ed.), Peking University Press
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787301272121（按标识回读: 基础有机化学（第4版）上册）
#手性 #对映异构体 #旋光性 #立体中心 #镜像
碳为什么通常形成四个键？
Why does carbon usually form four bonds?
碳原子基态有 2s²2p²，杂化后形成四个能量相近的 sp³ 轨道，每个容纳一个未成对电子，故可形成四个共价键以满足八隅体。Pauling 在 1939 年《化学键的本质》中系统解释了杂化与键的方向性。
A carbon atom has 2s²2p² valence electrons; after hybridization it forms four similar sp³ orbitals, each holding one unpaired electron, so it makes four covalent bonds to complete an octet. Pauling explained hybridization and bond directionality in 'The Nature of the Chemical Bond' (1939).
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
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Clayden《有机化学》；Pauling《化学键的本质》1939
Clayden, Organic Chemistry; Pauling, The Nature of the Chemical Bond (1939)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL63205W：Nature of the chemical bo
#碳四价 #杂化 #八隅体
酯化反应是什么？为什么会产生水果香味？
What is esterification and why does it produce fruity smells?
酯化是羧酸与醇在酸催化下脱水生成酯和水的反应，例如乙酸与乙醇生成乙酸乙酯。许多酯类具有挥发性并带有水果或花香气味，被用于香料工业。反应是可逆的，通常需除去水来提高产率。
Esterification is the acid-catalyzed condensation of a carboxylic acid with an alcohol to form an ester and water, e.g., acetic acid with ethanol giving ethyl acetate. Many esters are volatile with fruity or floral odors and are used in perfumery. The reaction is reversible, so removing water improves yield.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
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邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#酯化 #酯 #乙酸乙酯
为什么有些分子存在手性（对映异构）？
Why do some molecules show chirality (enantiomers)?
当分子含一个连有四个不同基团的手性中心（通常是碳原子）时，它与自身镜像无法重合，便形成一对对映体。Pasteur 在 1848 年从酒石酸盐首次分离出这种镜像异构体。
When a molecule has a stereocenter—usually carbon attached to four different groups—its mirror image cannot be superimposed, giving a pair of enantiomers. Pasteur first separated such mirror isomers from tartrate salts in 1848.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
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Clayden《有机化学》；Carey 与 Sundberg《高等有机化学》；Pasteur 1848
Clayden, Organic Chemistry; Carey & Sundberg, Advanced Organic Chemistry; Pasteur (1848)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL489216W：Advanced organic chemist
#手性 #对映体 #立体异构
对乙酰氨基酚（扑热息痛）属于哪类化合物？它为什么能退热？
What class of compound is paracetamol (acetaminophen), and why does it reduce fever?
对乙酰氨基酚含苯环、酰胺基和酚羟基，是酰胺类解热镇痛药。它通过抑制中枢神经系统的环加氧酶，减少前列腺素合成；前列腺素会升高体温设定点，所以药物能退热。常规剂量安全，过量则因代谢物N-乙酰对苯醌亚胺积聚而损伤肝脏。
Paracetamol contains a benzene ring, an amide group and a phenolic hydroxyl, making it an amide-type antipyretic analgesic. It inhibits cyclooxygenase in the central nervous system, cutting prostaglandin synthesis; because prostaglandins raise the body's temperature set point, fever falls. Normal doses are safe, but overdose damages the liver through accumulation of the metabolite NAPQI.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
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出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
ACS Journal of Chemical Education（药物化学专题）
ACS Journal of Chemical Education (medicinal chemistry feature)
#药物化学 #对乙酰氨基酚 #前列腺素
为什么烯烃（含 C=C 双键）和卤化氢加成时，氢原子往往加到含氢更多的那个碳上（马氏规则）？
Why, when an alkene adds hydrogen halide, does the hydrogen usually go to the more hydrogen-rich carbon (Markovnikov's rule)?
加成时先形成一个较稳定的碳正离子中间体；双键打开后，正电荷倾向于落在受到更多烷基给电子稳定（取代更多）的碳上，于是氢加在另一端、卤素加在更取代的碳上。这条经验规律就叫做马氏规则。
The addition first forms the more stable carbocation; opening the double bond places the positive charge on the carbon better stabilized by alkyl donation (more substituted), so hydrogen adds to the other end and the halogen to the more substituted carbon. This empirical pattern is Markovnikov's rule.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-11-03
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McMurry《有机化学》（第9版），第6章烯烃
McMurry, "Organic Chemistry" (9th ed.), Ch.6 Alkenes
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL57249W：Organic chemistry（首版 1984
#马氏规则 #烯烃 #亲电加成 #碳正离子
什么是官能团？为什么有机化学重视它？
What is a functional group and why does organic chemistry care about it?
官能团是分子中决定化合物特征化学性质的特定原子或原子团，如羟基（–OH）、羧基（–COOH）、氨基（–NH₂）。含有相同官能团的化合物往往发生相似的化学反应。因此按官能团分类是学习和预测有机物反应的核心方法。
A functional group is a specific atom or group of atoms responsible for a compound's characteristic chemistry, such as hydroxyl (–OH), carboxyl (–COOH), and amino (–NH₂). Compounds sharing a functional group tend to undergo similar reactions. Classifying by functional group is therefore central to learning and predicting organic reactions.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
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邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#官能团 #羟基 #羧基
什么是有机化学？
What is organic chemistry?
有机化学是研究含碳化合物的化学，碳能与氢、氧、氮等元素组成数量巨大的分子。生命体中的糖、脂肪、蛋白质和DNA都属于有机物。
Organic chemistry is the study of carbon-containing compounds, since carbon can combine with hydrogen, oxygen, nitrogen, and more to form a huge variety of molecules. Sugars, fats, proteins, and DNA in living things are all organic.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#有机化学 #碳 #化合物
糖是有机物吗？
Is sugar an organic compound?
是的，糖是含碳的有机物，主要由碳、氢、氧组成，如葡萄糖和蔗糖。它们为身体提供能量，也是植物光合作用的产物。
Yes, sugar is an organic compound containing carbon, mainly made of carbon, hydrogen, and oxygen, such as glucose and sucrose. They provide energy for the body and are products of plant photosynthesis.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
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邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#糖 #有机物 #葡萄糖
乙醇（酒精）是什么？
What is ethanol (alcohol)?
乙醇是一种常见的有机溶剂和饮料中的酒精，分子式为C2H5OH。它由糖发酵产生，既可用作燃料也可用于消毒。
Ethanol is a common organic solvent and the alcohol found in beverages, with the formula C2H5OH. It is produced by fermenting sugars and can be used as fuel and for disinfection.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#乙醇 #酒精 #发酵
汽油是从哪里来的？
Where does gasoline come from?
汽油来自石油，石油是远古生物形成的混合物，主要含碳氢化合物。炼油厂把原油分馏和加工，得到适合汽车的汽油。
Gasoline comes from petroleum, a mixture formed from ancient organisms and mainly containing hydrocarbons. Refineries distill and process crude oil to obtain gasoline suitable for cars.
难度 入门 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
邢其毅 等,《基础有机化学》第4版,北京大学出版社,2016
Xing Qiyi et al., Basic Organic Chemistry, 4th ed., Peking University Press, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787301272121（豆瓣书目条目: 基础有机化学）
#汽油 #石油 #烃