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Practice · Chemistry · 2025 syllabus · S3.2

IB Chemistry S3.2 Functional groups and organic structure: practice questions

12 exam-style questions on S3.2 Functional groups and organic structure, SL and HL, 7 marked HL: 8 multiple choice and 4 structured. Each one comes with the mark scheme, a model answer and the reasoning behind every mark. Free with your email.

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S3.2-01 · Paper 1A style · multiple choice · 1 mark

Groups in a painkiller

Paracetamol has the structure HO–C6H4–NH–CO–CH3. Which functional groups does it contain? [1]

  1. Carboxyl, amino and phenyl
  2. Hydroxyl, amido and phenyl
  3. Alkoxy, amino and phenyl
  4. Hydroxyl, amino and aldehyde
Show the answer and the reasoning

Answer: B. B is correct. –OH on the ring is a hydroxyl group, –NH–CO– is an amido group (amide link) and –C6H4– is a benzene ring (phenyl). A: there is no –COOH; the O–H and C=O are on different atoms. C: alkoxy would be C–O–C. D: the N is bonded to a C=O, which makes it amido, and there is no –CHO.

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The 12 questions in S3.2

  1. S3.2-01 Groups in a painkillerPaper 1A style · multiple choice · 1 mark
  2. S3.2-02 Naming a branched ketonePaper 1A style · multiple choice · 1 mark
  3. S3.2-03 Isomers of an acidPaper 1A style · multiple choice · 1 mark
  4. S3.2-04 Spotting a homologous seriesPaper 1A style · multiple choice · 1 mark
  5. S3.2-05 Which can show cis-trans isomerismPaper 1A style · multiple choice · 1 mark · HL
  6. S3.2-06 Finding a chiral carbonPaper 1A style · multiple choice · 1 mark · HL
  7. S3.2-07 Isomer from an NMR ratioPaper 1A style · multiple choice · 1 mark · HL
  8. S3.2-08 Splitting in 1-chloropropanePaper 1A style · multiple choice · 1 mark · HL
  9. S3.2-09 Group, series and isomerPaper 2 style · structured question · 5 marks
  10. S3.2-10 Identifying a compound from spectraPaper 2 style · structured question · 6 marks · HL
  11. S3.2-11 Enantiomers of lactic acidPaper 2 style · structured question · 5 marks · HL
  12. S3.2-12 When cis-trans isomers existPaper 2 style · structured question · 4 marks · HL

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Every Biology and Chemistry question here is original, written for practice in the style of the papers set since the 2025 syllabus, with invented data. Developed independently from the International Baccalaureate Organization, which has not endorsed it. Found a mistake? Email vytis@limeadmissions.com with the question id.