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CXC CAPE · · Chemistry

Alkanes, alkenes and reaction mechanisms
Practice Questions

89 CXC CAPE Chemistry questions on Alkanes, alkenes and reaction mechanisms, each with instant feedback and a full examiner-style mark scheme.

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✨ Revision guide includes key terms, worked examples and exam technique for Alkanes, alkenes and reaction mechanisms.

Try 2 sample questions on Alkanes, alkenes and reaction mechanisms

Question 1 · 1 mark · Difficulty 1/3

Which test shows that a hydrocarbon is unsaturated?

  1. It turns limewater milky
  2. It turns damp red litmus blue
  3. It gives a squeaky pop with a lighted splint
  4. It decolourises orange bromine water
Show answer & explanation
✓ Answer: D — It decolourises orange bromine water
Award 1 mark. Bromine adds across the C=C bond, so the orange colour disappears. Limewater tests for CO₂ and the squeaky pop is the test for hydrogen.
Question 2 · 1 mark · Difficulty 1/3

What is the name of the process that breaks long-chain alkanes into shorter, more useful molecules?

  1. Fractional distillation
  2. Polymerisation
  3. Cracking
  4. Reforming
Show answer & explanation
✓ Answer: C — Cracking
Award 1 mark. Cracking uses heat and a catalyst (or very high temperature) to split C–C bonds. Fractional distillation only separates the fractions; it breaks no bonds.
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CXC CAPE Chemistry: Alkanes, alkenes and reaction mechanisms FAQ

Is Kramizo free for CXC CAPE students preparing for Chemistry?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Alkanes, alkenes and reaction mechanisms practice with other Chemistry topics or even switch to a totally different CXC CAPE subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Alkanes, alkenes and reaction mechanisms questions aligned to the official CXC CAPE Chemistry syllabus?
Every question is written against the published CXC CAPE Chemistry specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CXC CAPE paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CXC CAPE.
How is Alkanes, alkenes and reaction mechanisms typically tested on CXC CAPE Chemistry papers?
Alkanes, alkenes and reaction mechanisms appears across multiple question types on real CXC CAPE Chemistry papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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