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O Level Chemistry: Organic chemistry, questions with answers

Practise 98 real questions on Organic chemistry from 2021 to 2026. See the answer and explanation as soon as you answer.

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98real questions
73multiple choice
11exam sessions

About Organic chemistry in O Level Chemistry

Organic chemistry is one of the 12 main topics in our O Level Chemistry (Cambridge (CAIE) 5070) question bank, and about 16% of its real questions come from it. Tayyari Karo has 98 real questions on this topic from 2021 to 2026, from Paper 1, Paper 2; 73 are multiple choice and marked instantly, and the rest are structured questions with a model answer. By difficulty: 89 medium, 5 easy, 4 hard.

Work through the questions below, then open the explanation for each one. Redo the ones you missed a few days later.

Try 6 real questions

These are real past-paper questions. Think of your answer first, then open the explanation.

May/June 2026 · Paper 1 · Organic chemistry

The structural formulae of three compounds are listed.
1 CH3COOH
2 HCOOCH3
3 CH3CH2OH
Which compounds are carboxylic acids?

  1. 1, 2 and 3
  2. 1 and 2 only
  3. 1 only
  4. 2 and 3 only
Show answer and explanation

Answer: C. 1 only

Only CH3COOH contains the –COOH carboxyl group; HCOOCH3 is an ester and CH3CH2OH is an alcohol.

May/June 2025 · Paper 1 · Organic chemistry

Protein to amino acids by

  1. oxidation
  2. hydrolysis
  3. esterification
  4. polymerisation
Show answer and explanation

Answer: B. hydrolysis

Hydrolysis.

May/June 2024 · Paper 1 · Organic chemistry

Methanol to methanoic acid is

  1. reduction
  2. oxidation
  3. esterification
  4. polymerisation
Show answer and explanation

Answer: B. oxidation

Oxidation.

May/June 2023 · Paper 1 · Organic chemistry

Esterification produces

  1. salt + water
  2. ester + water
  3. acid + base
  4. alkene + water
Show answer and explanation

Answer: B. ester + water

Ester + water.

May/June 2022 · Paper 1 · Organic chemistry

Which is unsaturated?

  1. ethane
  2. propane
  3. propene
  4. butane
Show answer and explanation

Answer: C. propene

Propene has a C=C double bond.

May/June 2021 · Paper 1 · Organic chemistry

Compound X: straight C-C-C chain with H. Which correct?

  1. saturated hydrocarbon
  2. isomer of butene
  3. decolourises bromine water
  4. named propane
Show answer and explanation

Answer: D. named propane

Straight C₃H₈ chain = propane.

Practise all 98 Organic chemistry questions

Sessions with Organic chemistry questions

SessionPaper 1Paper 2
May/June 202662
May/June 202573
Oct/Nov 202584
May/June 202462
Oct/Nov 202472
May/June 202372
Oct/Nov 202371
May/June 202262
Oct/Nov 202272
May/June 202153
Oct/Nov 202172

Common questions

What does the Organic chemistry topic cover on this page?

98 real O Level Chemistry (5070) questions on Organic chemistry from 2021 to 2026, from Paper 1, Paper 2. Each one shows the year, session and paper it came from.

Do I get the answers and explanations?

Yes. Every question shows the correct answer and a short explanation the moment you answer.

Is it free?

You can start free with no signup. A small set of papers per subject is free, and Premium unlocks every paper, the full question bank and the paper PDFs.

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