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HomeCIE IGCSE ChemistryAlkenes: structure, properties and reactions including addition reactions and polymerisation
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Alkenes: structure, properties and reactions including addition reactions and polymerisation
Practice Questions

20 CIE IGCSE Chemistry questions on Alkenes: structure, properties and reactions including addition reactions and polymerisation, 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 including addition reactions and polymerisation

Question 1 · 1 mark · Difficulty 1/3

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

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

What type of reaction occurs when hydrogen bromide (HBr) is added across the double bond of ethene to form bromoethane?

  1. A) Substitution reaction
  2. B) Elimination reaction
  3. C) Addition reaction
  4. D) Oxidation reaction
Show answer & explanation
✓ Answer: CC) Addition reaction
When HBr reacts with ethene, both atoms of HBr add across the C=C double bond to form a single product (bromoethane) with no atoms lost. This is the defining feature of an addition reaction. Substitution involves replacing an atom, while elimination removes atoms to form a double bond.
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CIE IGCSE Chemistry: Alkenes: structure, properties and reactions including addition reactions and polymerisation FAQ

How many CIE IGCSE Chemistry questions on Alkenes: structure, properties and reactions including addition reactions and polymerisation are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Alkenes: structure, properties and reactions including addition reactions and polymerisation for CIE IGCSE 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 CIE 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 CIE IGCSE 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 including addition reactions and polymerisation practice with other Chemistry topics or even switch to a totally different CIE 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 including addition reactions and polymerisation questions aligned to the official CIE IGCSE Chemistry syllabus?
Every question is written against the published CIE IGCSE Chemistry specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE 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 CIE.
How is Alkenes: structure, properties and reactions including addition reactions and polymerisation typically tested on CIE IGCSE Chemistry papers?
Alkenes: structure, properties and reactions including addition reactions and polymerisation appears across multiple question types on real CIE IGCSE 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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