Summary Amines, Amino Acids & Polymers: Formation, Reactions & Chirality – A-Level/IB Chemistry Notes

This document provides comprehensive A-Level/IB Chemistry notes on amines, amino acids, amides, and polymers, covering their formation, reactions, and structural properties. Key Topics Covered: Amines: Classification: Primary (1°), secondary (2°), tertiary (3°). Formation: Nucleophilic substitution of haloalkanes with ammonia. Reduction of nitriles (R-CN → R-CH₂NH₂) or nitro compounds (R-NO₂ → R-NH₂). Basicity: Acts as a proton acceptor (lone pair on N); forms salts with acids (e.g., R-NH 2 + HCl → R-NH 3 + Cl − R-NH 2 ​ +HCl→R-NH 3 + ​ Cl − ). Amino Acids & Chirality: Structure: Zwitterions (NH₃⁺-CHR-COO⁻) with acidic (COOH) and basic (NH₂) groups. Reactions: With acids/bases (forms salts). Esterification (amino acid + alcohol → ester + water). Chirality: Optical isomers (e.g., 1-chloroethanol) due to a carbon with four different groups. Polymers: Condensation Polymerization: Polyesters: Dicarboxylic acid + diol (e.g., Terephthalic acid + Ethylene glycol → PET). Polyamides: Diacyl chloride + diamine (e.g., Nylon-6,6). Hydrolysis: Breakdown of esters/amides using water (acidic or alkaline conditions). Reaction Mechanisms: Nucleophilic addition (e.g., HCN to carbonyls to form nitriles). Reduction of nitriles to amines. Why This Document is Useful: Exam-Focused – Covers reaction mechanisms, polymer formation, and isomerism. Clear Diagrams – Illustrates chiral centers, zwitterions, and polymerization. Practical Applications – Esterification, peptide bonds, and synthetic polymers (Nylon, PET). Structured & Concise – Ideal for quick revision before tests. Perfect for students mastering nitrogen-containing compounds or teachers preparing lessons on organic synthesis!