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HomeCXC CSEC ChemistryAlkenes: Structure, Properties and Reactions
CXC · CSEC · Chemistry

Alkenes: Structure, Properties and Reactions
Practice Questions

20 CXC CSEC Chemistry questions on Alkenes: Structure, Properties and Reactions, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Alkenes: Structure, Properties and Reactions

Question 1 · 1 mark · Difficulty 1/3

Which of the following is the correct general formula for alkenes?

  1. CₙH₂ₙ₊₂
  2. CₙH₂ₙ
  3. CₙH₂ₙ₋₂
  4. CₙHₙ
Show answer & explanation
✓ Answer: BCₙH₂ₙ
Alkenes have the general formula CₙH₂ₙ because the presence of one carbon-carbon double bond means two fewer hydrogen atoms compared to the equivalent alkane (CₙH₂ₙ₊₂). CₙH₂ₙ₋₂ is the formula for alkynes, and CₙH₂ₙ₊₂ is for alkanes.
Question 2 · 1 mark · Difficulty 1/3

Ethene reacts with hydrogen gas in the presence of a nickel catalyst. What is the product of this reaction?

  1. Methane
  2. Ethane
  3. Propane
  4. Ethanol
Show answer & explanation
✓ Answer: BEthane
When ethene (CH₂=CH₂) undergoes hydrogenation with H₂ and a nickel catalyst, hydrogen adds across the double bond to form ethane (CH₃CH₃). This is an addition reaction. The catalyst lowers the activation energy but is not consumed in the reaction.
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CXC CSEC Chemistry: Alkenes: Structure, Properties and Reactions FAQ

How many CXC CSEC Chemistry questions on Alkenes: Structure, Properties and Reactions are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Alkenes: Structure, Properties and Reactions for CXC CSEC Chemistry, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CXC paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CXC CSEC 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 Alkenes: Structure, Properties and Reactions practice with other Chemistry topics or even switch to a totally different CXC 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 Alkenes: Structure, Properties and Reactions questions aligned to the official CXC CSEC Chemistry syllabus?
Every question is written against the published CXC CSEC 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 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.
How is Alkenes: Structure, Properties and Reactions typically tested on CXC CSEC Chemistry papers?
Alkenes: Structure, Properties and Reactions appears across multiple question types on real CXC CSEC 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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