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HomeCIE IGCSE ChemistryAlkanes: structure, properties and reactions including combustion and substitution
CIE · IGCSE · Chemistry

Alkanes: structure, properties and reactions including combustion and substitution
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20 CIE IGCSE Chemistry questions on Alkanes: structure, properties and reactions including combustion and substitution, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Alkanes: structure, properties and reactions including combustion and substitution

Question 1 · 1 mark · Difficulty 1/3

What is the general formula for alkanes?

  1. CnH2n
  2. CnH2n+2
  3. CnH2n-2
  4. CnHn
Show answer & explanation
✓ Answer: BCnH2n+2
Alkanes are saturated hydrocarbons with the general formula CnH2n+2. Each carbon forms four single bonds, and the two 'extra' hydrogens come from the two end carbon atoms in the chain. CnH2n is the general formula for alkenes.
Question 2 · 1 mark · Difficulty 1/3

Methane reacts with chlorine in the presence of ultraviolet light. Which type of reaction is this?

  1. Addition reaction
  2. Elimination reaction
  3. Substitution reaction
  4. Neutralisation reaction
Show answer & explanation
✓ Answer: CSubstitution reaction
The reaction between methane and chlorine in UV light is a substitution reaction, in which a hydrogen atom is replaced by a chlorine atom to give chloromethane and hydrogen chloride. Addition reactions are characteristic of unsaturated compounds such as alkenes.
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CIE IGCSE Chemistry: Alkanes: structure, properties and reactions including combustion and substitution FAQ

How many CIE IGCSE Chemistry questions on Alkanes: structure, properties and reactions including combustion and substitution are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Alkanes: structure, properties and reactions including combustion and substitution 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 Alkanes: structure, properties and reactions including combustion and substitution 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 Alkanes: structure, properties and reactions including combustion and substitution 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 Alkanes: structure, properties and reactions including combustion and substitution typically tested on CIE IGCSE Chemistry papers?
Alkanes: structure, properties and reactions including combustion and substitution 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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