AQA Chemistry Organic Chemistry 规划

AQA Chemistry 有机化学 汇总

Organic chemistry is the beating heart of A-Level Chemistry, and for AQA students, it accounts for a significant portion of both Paper 2 and Paper 3. This guide brings together the entire AQA organic chemistry syllabus — from the basics of nomenclature to the depths of NMR spectroscopy — in one comprehensive bilingual reference. 有机化学是A-Level化学的核心板块，在AQA考试中占据Paper 2和Paper 3的很大分值。本文汇总AQA有机化学全部核心知识点，从基础命名到核磁共振波谱，一文打通中英双语学习脉络。

📋 考试局 Exam Board
AQA A-Level Chemistry (7405) 📝 相关试卷 Papers
Paper 2: Organic & Physical
Paper 3: Synoptic + Practical ⏱️ 分值占比 Weight
约35-40% of total marks

1. 命名法与同分异构 Nomenclature and Isomerism

The foundation of organic chemistry rests on IUPAC nomenclature. AQA expects you to name compounds using systematic rules and identify different types of isomerism. 有机化学的基石是IUPAC命名法。AQA要求考生掌握系统命名规则并能识别各类同分异构现象。

Key Naming Rules 命名关键规则：

• Identify the longest carbon chain (parent chain) 识别最长碳链（母链）
• Number the chain to give lowest numbers to substituents 编号使取代基得到最小数字
• Name substituents as prefixes in alphabetical order 按字母顺序排列取代基
• Functional groups determine the suffix (e.g. -ol for alcohols, -oic acid for carboxylic acids) 官能团决定后缀

烷烃 Alkane
后缀: -ane
CₙH₂ₙ₊₂ 烯烃 Alkene
后缀: -ene
CₙH₂ₙ 醇 Alcohol
后缀: -ol
R-OH 羧酸 Acid
后缀: -oic acid
R-COOH 胺 Amine
后缀: -amine
R-NH₂

Types of Isomerism 同分异构类型：

• Structural isomerism 结构异构 — same molecular formula, different structural formula (chain, position, functional group) 相同分子式，不同结构式（碳链异构、位置异构、官能团异构）
• Stereoisomerism 立体异构 — same structural formula, different spatial arrangement 相同结构式，不同空间排列
• E/Z isomerism E/Z异构 — restricted rotation around C=C double bond, two different groups on each carbon 碳碳双键旋转受限，每个碳上连有两个不同基团
• Optical isomerism 光学异构 — chiral carbon with four different groups, non-superimposable mirror images 手性碳连有四个不同基团，互为不可重叠的镜像

2. 烷烃与自由基取代 Alkanes and Free Radical Substitution

Alkanes are saturated hydrocarbons with general formula CₙH₂ₙ₊₂. They are relatively unreactive due to strong C-C and C-H bonds, but undergo combustion and free radical substitution with halogens. 烷烃是饱和烃，通式为CₙH₂ₙ₊₂。由于C-C和C-H键较强，烷烃相对稳定，但可在紫外光下与卤素发生自由基取代反应。

Free Radical Substitution Mechanism 自由基取代机理 (3 steps 三步)：

1. Initiation 链引发: Cl₂ → 2Cl• (UV light breaks Cl-Cl bond homolytically 紫外光均裂Cl-Cl键)
2. Propagation 链增长: Cl• + CH₄ → HCl + •CH₃ → then •CH₃ + Cl₂ → CH₃Cl + Cl•
3. Termination 链终止: Cl• + Cl• → Cl₂ / •CH₃ + •CH₃ → C₂H₆ / Cl• + •CH₃ → CH₃Cl

Exam Tip 考试技巧: When drawing curly arrows in free radical mechanisms, use single-barbed arrows (fish-hook arrows) to show movement of single electrons. 自由基机理中用单钩箭头表示单电子转移。

3. 卤代烷与亲核取代 Halogenoalkanes and Nucleophilic Substitution

Halogenoalkanes undergo nucleophilic substitution due to the polar C-X bond, where the halogen carries a partial negative charge and the carbon is electron-deficient. 卤代烷因C-X键的极性易发生亲核取代，卤素带部分负电荷，碳原子缺电子。

NaOH (aq) 氢氧化钠水溶液
Reagent: NaOH (aq), warm
Product: Alcohol (ROH)
Type: Nucleophilic substitution 亲核取代
Condition: Reflux, aqueous 回流加热 KCN (alc) 氰化钾醇溶液
Reagent: KCN in ethanol
Product: Nitrile (RCN)
Type: Nucleophilic substitution 亲核取代
Note: Increases chain length by 1 碳链加长1个 NH₃ (excess) 过量氨
Reagent: Excess conc. NH₃ in ethanol
Product: Amine (RNH₂)
Type: Nucleophilic substitution 亲核取代
Pressure: Sealed tube 密封管加热

Elimination vs Substitution 消除与取代对比: With OH⁻ in ethanolic conditions and heat, halogenoalkanes undergo elimination to form alkenes. In aqueous conditions, substitution dominates. OH⁻在乙醇溶液中加热 → 消除生成烯烃; 水溶液中 → 取代为主。

4. 烯烃与亲电加成 Alkenes and Electrophilic Addition

Alkenes are unsaturated hydrocarbons containing a C=C double bond. The pi bond is a region of high electron density, making alkenes susceptible to electrophilic attack. 烯烃含碳碳双键，π键区域电子云密度高，易受亲电试剂进攻。

Key Electrophilic Addition Reactions 亲电加成反应汇总：

• HBr / HCl → Haloalkane 卤代烷。With unsymmetrical alkenes, Markovnikov's rule applies: H adds to the carbon with more H atoms already attached 不对称烯烃遵循马氏规则：氢加到含氢较多的碳上
• H₂SO₄ (conc), then H₂O → Alcohol 醇。Industrial hydration of ethene to ethanol 工业制备乙醇
• Br₂ (aq) → Dibromoalkane 二溴代烷。Orange to colourless — test for unsaturation 溴水褪色反应，用于检验不饱和键
• H₂, Ni catalyst, 150°C → Alkane 烷烃。Catalytic hydrogenation 催化加氢

Addition Polymers 加成聚合物: Alkenes can undergo addition polymerisation. E.g. poly(ethene) from ethene, poly(propene) from propene. Disposal issues: non-biodegradable, but can be recycled or incinerated for energy. 烯烃可发生加聚反应。废弃问题：不可生物降解，但可回收或焚烧发电。

5. 醇类 Alcohols

Alcohols contain the hydroxyl (-OH) functional group. Their chemistry is dominated by the polarity of the O-H and C-O bonds. 醇含羟基官能团，化学性质由O-H和C-O键的极性决定。

氧化 Oxidation
Primary → Aldehyde → Carboxylic Acid
Secondary → Ketone
Tertiary → No reaction
Reagent: K₂Cr₂O₇/H₂SO₄, distil or reflux 消除 Elimination
Alcohol → Alkene + H₂O
Reagent: Conc. H₂SO₄ or Al₂O₃
Condition: Heat, 170°C (H₂SO₄)
Saytzeff's rule applies 酯化 Esterification
Alcohol + Carboxylic Acid ⇌ Ester + H₂O
Catalyst: Conc. H₂SO₄
Condition: Reflux

Distinguishing Alcohols 鉴别醇类: Use acidified potassium dichromate(VI). Primary and secondary alcohols turn solution from orange to green; tertiary alcohols show no colour change. 酸化重铬酸钾溶液：伯醇和仲醇使溶液由橙变绿，叔醇无变化。

6. 醛酮与羰基化合物 Aldehydes, Ketones and Carbonyls

The carbonyl group (C=O) is polar due to the electronegativity difference between carbon and oxygen. Carbonyl compounds undergo nucleophilic addition reactions. 羰基因碳氧电负性差异而具有极性，羰基化合物可发生亲核加成反应。

Key Reactions 核心反应：

• NaBH₄ reduction 硼氢化钠还原: Aldehyde → Primary Alcohol; Ketone → Secondary Alcohol. Nucleophilic addition of H⁻ ion 亲核加成H⁻离子
• KCN, H⁺ 氰化钾酸化: Carbonyl → Hydroxynitrile. Increases carbon chain length by 1 碳链加长1个碳原子
• 2,4-DNP test 2,4-二硝基苯肼测试: Orange precipitate confirms presence of C=O group 橙黄色沉淀确认羰基存在
• Tollens' reagent 托伦试剂: Silver mirror with aldehydes ONLY (not ketones). Aldehydes are oxidised to carboxylic acids 只有醛能产生银镜，酮不能
• Fehling's solution 斐林试剂: Blue to brick-red precipitate with aldehydes only 只有醛能使蓝色溶液变为砖红色沉淀

7. 羧酸及其衍生物 Carboxylic Acids and Derivatives

Carboxylic acids are weak acids that partially dissociate in water. They form salts with metals, bases, and carbonates. 羧酸是弱酸，在水中部分电离，可与金属、碱和碳酸盐反应生成盐。

Derivatives 衍生物：

• Acyl chlorides 酰氯 (R-COCl): Most reactive derivative. Reacts vigorously with water, alcohols, ammonia, and amines 反应活性最高，与水、醇、氨、胺剧烈反应
• Acid anhydrides 酸酐 (R-CO-O-CO-R): Less vigorous than acyl chlorides, safer for lab use. Used to make esters and amides 比酰氯温和，更安全，用于制酯和酰胺
• Esters 酯 (R-COOR'): Sweet-smelling liquids. Formed by esterification. Hydrolysed by acid or base (saponification) 有果香味的液体，酸性或碱性水解（皂化反应）
• Amides 酰胺 (R-CONH₂): Formed from acyl chlorides + ammonia. Can be dehydrated to nitriles with P₄O₁₀ 由酰氯与氨反应制得，可与P₄O₁₀脱水生成腈

8. 芳香化学 Aromatic Chemistry

Benzene (C₆H₆) is the archetypal aromatic compound. The delocalised pi electron system above and below the ring gives benzene exceptional stability. Electrophilic substitution is the characteristic reaction — benzene preserves its aromaticity rather than undergoing addition. 苯是芳香化合物的代表。离域π电子体系赋予苯特殊的稳定性。苯的特征反应是亲电取代——苯通过取代而非加成来保持芳香性。

广告 / Sponsored

Electrophilic Substitution Reactions 亲电取代反应：

• Nitration 硝化: HNO₃ + H₂SO₄ (catalyst), 50-55°C → Nitrobenzene. Above 55°C leads to further substitution 温度过高会导致多硝基取代
• Friedel-Crafts Acylation 傅克酰基化: Acyl chloride + AlCl₃ (anhydrous) → Phenyl ketone. Important for C-C bond formation 重要的碳碳键形成方法
• Halogenation 卤代: Br₂ or Cl₂ + AlBr₃/AlCl₃ (halogen carrier) → Halogenobenzene 卤素载体催化

9. 胺类 Amines

Amines are organic derivatives of ammonia. They act as bases (lone pair on nitrogen accepts protons) and nucleophiles. 胺是氨的有机衍生物，氮上的孤对电子使其具有碱性和亲核性。

Basicity order 碱性顺序: Secondary > Primary > Tertiary (in gas phase) > Ammonia > Aromatic amines. Aromatic amines are much weaker bases because the lone pair is delocalised into the benzene ring. 芳香胺因孤对电子参与苯环离域，碱性远弱于脂肪胺。

Preparation 制备方法：

• From halogenoalkanes 卤代烷氨解: RX + excess NH₃ (ethanolic, sealed tube) → RNH₂. Further substitution can occur, giving mixtures 过量氨防止进一步取代
• From nitriles 腈还原: RCN + 4[H] (LiAlH₄ in dry ether) → RCH₂NH₂. Increases chain length 加长碳链
• From nitro compounds 硝基还原: Nitrobenzene + 6[H] (Sn + conc. HCl, then NaOH) → Phenylamine. Key route to aromatic amines 制备芳香胺的关键路线

10. 聚合物 Polymers

AQA covers both addition and condensation polymers. Understanding their structure, properties, and environmental impact is essential. AQA考试涵盖加成聚合和缩合聚合两大类，需理解结构、性质及环境影响。

加成聚合 Addition
Monomer: Alkene
No small molecule lost
Backbone: C-C only
Examples: Poly(ethene), PVC, PTFE 缩合聚合 Condensation
Monomers: Diol + Dicarboxylic acid / Diamine
Small molecule lost (H₂O / HCl)
Backbone: Contains ester or amide links
Examples: Polyesters, Polyamides (Nylon, Kevlar)

Biodegradability 生物降解性: Condensation polymers with ester/amide links can be hydrolysed, making them potentially biodegradable. Addition polymers have strong C-C backbones and resist degradation. 含酯键或酰胺键的缩合聚合物可水解，具有生物降解潜力；加成聚合物的C-C骨架稳定，难以降解。

11. 氨基酸、蛋白质与DNA Amino Acids, Proteins and DNA

Amino acids contain both amine (-NH₂) and carboxylic acid (-COOH) groups. They exist as zwitterions at their isoelectric point. Proteins are condensation polymers of amino acids joined by peptide links. 氨基酸同时含氨基和羧基，在等电点以两性离子存在。蛋白质是由肽键连接的氨基酸缩合聚合物。

DNA Structure DNA结构: Deoxyribonucleic acid is a condensation polymer of nucleotides. Each nucleotide consists of a phosphate group, deoxyribose sugar, and a nitrogenous base (A, T, C, G). The double helix is held together by hydrogen bonds between complementary base pairs: A=T (2 H-bonds) and C≡G (3 H-bonds). DNA是核苷酸的缩合聚合物。核苷酸由磷酸基、脱氧核糖和含氮碱基组成。双螺旋结构由互补碱基对之间的氢键维持。

Cisplatin 顺铂: Pt(NH₃)₂Cl₂ — a square planar complex used as an anticancer drug. It binds to DNA, preventing cell division. Cis isomer is active; trans isomer is not. 顺铂是平面正方形配合物，用作抗癌药物，通过与DNA结合阻止细胞分裂。顺式异构体有效，反式无效。

12. 有机分析 Organic Analysis

Modern organic analysis relies on spectroscopic techniques. AQA requires interpretation of IR, Mass Spectrometry, and NMR spectra. 现代有机分析依赖波谱技术，AQA要求解析红外、质谱和核磁共振谱图。

红外光谱 IR Spectroscopy
Identifies functional groups by bond vibrations
通过键的振动频率识别官能团
Key peak: C=O at 1680-1750 cm⁻¹
O-H (alcohol) broad at 3230-3550 cm⁻¹
O-H (acid) very broad at 2500-3300 cm⁻¹ 质谱 Mass Spectrometry
Gives molecular ion peak (M⁺) = Mr
给出分子离子峰确定相对分子质量
Fragmentation patterns help deduce structure
碎片离子峰帮助推断结构
High-resolution MS gives exact mass

¹³C NMR 碳谱: Number of peaks = number of unique carbon environments. Chemical shift ranges: C=O (160-220 ppm), aromatic (110-160 ppm), C-O (50-90 ppm), C-C (0-50 ppm). 峰的数量等于不同化学环境碳原子的数量。

¹H NMR 氢谱: Number of peaks = number of unique proton environments. Integration (area under peak) tells relative number of protons in each environment. Splitting pattern follows n+1 rule: a proton with n neighbouring non-equivalent protons splits into n+1 peaks. 积分面积比代表各环境中质子数量比，裂分遵循n+1规则。

Singlet
单峰
No neighbouring H
0 neighbouring protons Doublet
双重峰
1 neighbouring H
n+1 = 2 peaks Triplet
三重峰
2 neighbouring H
n+1 = 3 peaks Quartet
四重峰
3 neighbouring H
n+1 = 4 peaks

Chromatography 色谱法: Thin-layer chromatography (TLC) and gas chromatography (GC) separate mixtures. Rf value = distance moved by spot / distance moved by solvent front. Retention time in GC identifies components. 薄层色谱与气相色谱分离混合物，Rf值和保留时间用于鉴定组分。

13. 有机合成路线 Organic Synthesis Pathways

The AQA syllabus expects you to design multi-step synthesis routes connecting different functional groups. Here is a condensed map of key interconversions. AQA大纲要求能设计多步合成路线，以下汇总关键官能团转化路径。

Alkane → Haloalkane: X₂, UV light (free radical substitution)
Haloalkane → Alcohol: NaOH (aq), warm (nucleophilic substitution)
Haloalkane → Nitrile: KCN (alc), reflux (nucleophilic substitution)
Haloalkane → Amine: Excess NH₃ (alc), sealed tube
Haloalkane → Alkene: NaOH (alc), reflux (elimination)
Alkene → Alkane: H₂, Ni catalyst, 150°C (hydrogenation)
Alkene → Haloalkane: HX or X₂ (electrophilic addition)
Alkene → Alcohol: H₂SO₄ (conc), then H₂O (hydration) Alcohol → Alkene: Conc. H₂SO₄ or Al₂O₃, heat (elimination)
1° Alcohol → Aldehyde: K₂Cr₂O₇/H⁺, distil (oxidation)
1° Alcohol → Acid: K₂Cr₂O₇/H⁺, reflux (full oxidation)
2° Alcohol → Ketone: K₂Cr₂O₇/H⁺, distil
Nitrile → Amine: LiAlH₄ in dry ether (reduction)
Nitrile → Acid: HCl (aq), reflux (acid hydrolysis)
Aldehyde → 1° Alcohol: NaBH₄ in water (reduction)
Ketone → 2° Alcohol: NaBH₄ in water (reduction)

🛍️ 微信小店好物推荐

fx-991CN X 中文版计算器-老王推荐

¥168.00 🛒 微信小店购买

考试冲刺建议 Exam Preparation Tips

• Mechanism mastery 机理为王: Practice drawing curly arrow mechanisms until they become automatic. AQA allocates significant marks for accurate mechanistic diagrams. 反复练习箭头机理直到形成肌肉记忆，AQA在机理图上给分很大方。
• Reagent-Reaction-Product tables 三列表格法: For each functional group, memorise: starting material, reagents/conditions, and product. Create a master summary table. 为每个官能团整理：起始物、试剂条件、产物的三列汇总表。
• Spectroscopy practice 波谱练习: Do as many combined spectral analysis problems as possible. The ability to deduce a structure from IR + MS + NMR is the highest-level skill tested. 多做IR+质谱+NMR的联合解谱题，这是最高阶的考试技能。
• Organic synthesis routes 合成路线串联: Map out conversion pathways between all functional groups. This helps with the multi-step synthesis questions. 画出所有官能团之间的转化路线图，帮助应对多步合成题。
• Past papers under timed conditions 限时刷真题: Organic chemistry questions are often long and interconnected. Practice under exam conditions to build speed. 有机化学题目通常篇幅较长且相互关联，限时训练至关重要。

🎓 更多A-Level化学学习资源与1对1辅导

16621398022同微信 | tutorhao.com

更多咨询请联系16621398022（同微信）