IGCSE Practice

Cambridge IGCSE·Co-ordinated Sciences 0654·Chemistry Alkanes Alkenes
📋Key knowledge — Organic Chemistry

Formulas & equations

  • Combustion of alkane: CₙH₂ₙ₊₂ + O₂ → CO₂ + H₂O
  • Addition of H₂ to alkene: CₙH₂ₙ + H₂ → CₙH₂ₙ₊₂ (hydrogenation)
  • Fermentation: C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ (ethanol production)
  • Esterification: alcohol + carboxylic acid ⇌ ester + water (concentrated H₂SO₄ catalyst)

Key facts & rules

  • Alkanes: saturated (only C−C single bonds). General formula CₙH₂ₙ₊₂. Methane (CH₄), ethane (C₂H₆), propane, butane.
  • Alkenes: unsaturated (contain C=C double bond). General formula CₙH₂ₙ. Ethene (C₂H₄), propene.
  • Test for alkene: bromine water → decolourises (goes from orange to colourless).
  • Cracking: long-chain alkanes → shorter alkanes + alkenes (thermal or catalytic cracking).
  • Addition polymerisation: alkene monomers → polymer (e.g. ethene → poly(ethene)).
  • Fractional distillation of crude oil: different chain lengths have different boiling points — separated by size.

IGCSE Chemistry — Alkanes & alkenes

42 Cambridge IGCSE 0654 questions on alkanes & alkenes, across all three components.

About alkanes & alkenes on IGCSE 0654

Every Cambridge IGCSE Co-ordinated Sciences 0654 question on alkanes & alkenes (Organic chemistry, Chemistry), across all three exam components. Theory and alternative-to-practical come with full mark schemes; multiple choice is interactive — click an option to check it.

Theory

Papers 3 & 4 · 20 questions · Structured written questions, each with its full mark scheme.
Alkanes & alkenes — Core theory questions12 total · Paper 3

Exercise 1 — IGCSE 0654 Nov 2025 Paper 32 Q6

Cambridge past paperCore11 marks Paper 32Nov 2025
IGCSE 0654 Nov 2025 Paper 32 Question 6 — Alkanes & alkenes
Show mark scheme
Mark scheme for IGCSE 0654 Nov 2025 Paper 32 Q6

Exercise 2 — IGCSE 0654 Nov 2025 Paper 33 Q6

Cambridge past paperCore11 marks Paper 33Nov 2025
IGCSE 0654 Nov 2025 Paper 33 Question 6 — Alkanes & alkenes
Show mark scheme
Mark scheme for IGCSE 0654 Nov 2025 Paper 33 Q6

Exercise 3 — IGCSE 0654 Nov 2025 Paper 31 Q6

Cambridge past paperCore10 marks Paper 31Nov 2025
IGCSE 0654 Nov 2025 Paper 31 Question 6 — Alkanes & alkenes
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Mark scheme for IGCSE 0654 Nov 2025 Paper 31 Q6
Alkanes & alkenes — Extended theory questions8 total · Paper 4

Exercise 4 — IGCSE 0654 Nov 2025 Paper 42 Q5

Cambridge past paperExtended11 marks Paper 42Nov 2025
IGCSE 0654 Nov 2025 Paper 42 Question 5 — Alkanes & alkenes
Show mark scheme
Mark scheme for IGCSE 0654 Nov 2025 Paper 42 Q5

Exercise 5 — IGCSE 0654 Jun 2024 Paper 42 Q8

Cambridge past paperExtended12 marks Paper 42Jun 2024
IGCSE 0654 Jun 2024 Paper 42 Question 8 — Alkanes & alkenes
Show mark scheme
Mark scheme for IGCSE 0654 Jun 2024 Paper 42 Q8

Exercise 6 — IGCSE 0654 Nov 2024 Paper 42 Q5

Cambridge past paperExtended11 marks Paper 42Nov 2024
IGCSE 0654 Nov 2024 Paper 42 Question 5 — Alkanes & alkenes
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Mark scheme for IGCSE 0654 Nov 2024 Paper 42 Q5
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Multiple choice

Papers 1 & 2 · 22 questions · Click an option (A–D) to check your answer instantly.
Alkanes & alkenes — Core multiple choice questions8 total · Paper 1

Exercise 1 — IGCSE 0654 May/June 2025 Paper 11 Q24

Cambridge past paperCore1 mark Paper 11May/June 2025
IGCSE 0654 May/June 2025 Paper 11 Question 24 — Alkanes & alkenes
Show answer
Correct answer: C

Exercise 2 — IGCSE 0654 Oct/Nov 2025 Paper 12 Q25

Cambridge past paperCore1 mark Paper 12Oct/Nov 2025
IGCSE 0654 Oct/Nov 2025 Paper 12 Question 25 — Alkanes & alkenes
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Correct answer: C

Exercise 3 — IGCSE 0654 Oct/Nov 2025 Paper 13 Q25

Cambridge past paperCore1 mark Paper 13Oct/Nov 2025
IGCSE 0654 Oct/Nov 2025 Paper 13 Question 25 — Alkanes & alkenes
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Correct answer: C

Exercise 4 — IGCSE 0654 March 2024 Paper 12 Q27

Cambridge past paperCore1 mark Paper 12March 2024
IGCSE 0654 March 2024 Paper 12 Question 27 — Alkanes & alkenes
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Correct answer: D
Alkanes & alkenes — Extended multiple choice questions14 total · Paper 2

Exercise 5 — IGCSE 0654 Oct/Nov 2025 Paper 21 Q24

Cambridge past paperExtended1 mark Paper 21Oct/Nov 2025
IGCSE 0654 Oct/Nov 2025 Paper 21 Question 24 — Alkanes & alkenes
Show answer
Correct answer: B

Exercise 6 — IGCSE 0654 May/June 2025 Paper 21 Q26

Cambridge past paperExtended1 mark Paper 21May/June 2025
IGCSE 0654 May/June 2025 Paper 21 Question 26 — Alkanes & alkenes
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Correct answer: B

Exercise 7 — IGCSE 0654 Oct/Nov 2025 Paper 22 Q17

Cambridge past paperExtended1 mark Paper 22Oct/Nov 2025
IGCSE 0654 Oct/Nov 2025 Paper 22 Question 17 — Alkanes & alkenes
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Correct answer: A

Exercise 8 — IGCSE 0654 March 2025 Paper 22 Q25

Cambridge past paperExtended1 mark Paper 22March 2025
IGCSE 0654 March 2025 Paper 22 Question 25 — Alkanes & alkenes
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Correct answer: C
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