A-LevelChemistryHalogen derivatives9701/12 · May/June 2016 · Q201 Mark

Chlorofluorocarbons damage the ozone layer by undergoing reactions with a free radical mechanism. The first stage of this is initiation. Which equation is most likely to be the initiation stage when chlorofluoromethane is involved in such a reaction?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

A[Diagram showing homolytic cleavage of the C-Cl bond in CH₂FCl]

B[Diagram showing homolytic cleavage of a C-H bond in CH₂FCl]

C[Diagram showing homolytic cleavage of the C-F bond in CH₂FCl]

D[Diagram showing heterolytic fragmentation of CH₂FCl]

✓ Correct answer

B: [Diagram showing homolytic cleavage of a C-H bond in CH₂FCl]

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Topic: Halogen derivatives, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2016 Paper 1 Variant 2, question 20.

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