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CAIE IGCSE Chemistry General Formulae of Homologous Series

Practise recalling and applying general formulae for alkanes, alkenes, alcohols and carboxylic acids to identify series or calculate member formulae.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • recall the general formulae for alkanes and alkenes and substitute the stated carbon number
  • apply the alcohol and carboxylic-acid general formulae without dropping the functional group
  • derive or recognise a homologous-series formula from several molecular formulae in a table

11.1.2—Write and interpret general formulae question 1

[Maximum number: 1]

Propane, propene, propan-1-ol and propanoic acid are members of different homologous series. Molecules of these substances contain three carbon atoms.

State the general formula of the homologous series to which propanoic acid belongs.

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