Unit 4

Details for the A2 Unit 4 will be published here:

Unit 4 will be taught through 3 sections.

  • Rings, Acids and Amines
  • Polymers and Synthesis
  • Analysis

Rings, acids and amines

  • Structure of Benzene
  • Why is benzene weird?
    • Why does it not decolourise bromine?
    • Why are the bonds all the same length and not the length of either an alkane or an alkene
    • Why is the enthalpy of hydration not as expected
  • Aromaticity
  • Reactivity of Benzene
  • Phenols and their reactions
  • Oxidation of alcohols and aldehydes
  • Carbonyl chemistry
  • Tests for carbonyls
  • Carboxylic acids
  • Esters
    • Esters in living organisms
  • Amine chemistry

Polymers and synthesis

  • Amino acids
  • Polypeptides, polyamides and polyesters
  • Optical isomerism
  • Organic synthesis of aliphatic compounds (straight chains)
  • Organic synthesis of aromatic compounds (rings)
  • Problems of chirality


  • IR
  • MS
  • H-NMR
  • C-NMR
  • TLC
  • GC
  • Combined techniques
    • GC-MS
    • LC-NMR

Past papers

You can find and download past papers from the OCR website here