Chapter 3: Alkanes, Cracking and Radical Substitution

A-level ChemistryModule 4: Core Organic Chemistry7 topicsHigher

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alevel · chemistry · Module 4: Core Organic Chemistry · All papers

Releases 1 August 2026

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Module 4: Core Organic Chemistry: Alkanes, Cracking and Radical Substitution - Authored Long Answer Questions

Examiner-style long-answer practice with automatic marking, improvement advice and ProofCoach tracking.

4 questions25 marks37.5 min

standard / hard

6 marksdescribestandardOCR A

For Alkanes, Cracking and Radical Substitution, describe how free-radical substitution and alkane reactivity applies to methane chlorination under ultraviolet light.

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6 markscalculatehardOCR A

Using methane chlorination under ultraviolet light, calculate a relevant OCR A Alkanes, Cracking and Radical Substitution quantity and explain the physical or chemical meaning of the answer. Show equation, substitution, answer and unit.

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7 marksexplainhardOCR A

Alkanes, Cracking and Radical Substitution: Ultraviolet exposure time (min) vs Chloromethane yield (%)

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The graph for Alkanes, Cracking and Radical Substitution shows data from methane chlorination under ultraviolet light. Explain the pattern using the data and relevant chemistry principles.

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6 marksevaluatestandardOCR A

In methane chlorination under ultraviolet light, evaluate the experimental method or model assumptions used when applying free-radical substitution and alkane reactivity.

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2. Mechanisms and Curly-Arrow Logic

4. Alkenes, Electrophilic Addition and Polymers

Key learning objectives

Understand the key principles behind Alkanes, Cracking and Radical Substitution.
Apply these ideas to exam-style questions.
Recall the essential definitions and key terms.