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IB Chemistry SL 3.3.3 Radical Substitution Questions

Use real SL exam questions to write alkane-halogen radical mechanisms, including UV initiation, propagation and termination.

Syllabus
First assessment 2025
Course
Chemistry SL
Level
SL

Exam points

  • Write the halogen initiation step under UV light or heat, showing homolytic fission and correctly marked radicals.
  • Write propagation steps for alkane halogenation, consuming one radical and regenerating the chain carrier.
  • Write termination by combining radicals and explain the mixture of substitution products formed from an alkane.

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Study 3.3.3—Radical substitution conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry SL 3.3.3 Radical Substitution Questions question 1

[Maximum number: 1]

Chlorine undergoes many reactions.

State the type of reaction occurring when ethane reacts with chlorine to produce chloroethane.

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