A-LevelChemistryHalogen derivativesMay/June 2016Paper 1 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?

Q: What topic does this question test?

This question tests Halogen derivatives in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

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

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

📋 Examiner Report & Trap Analysis

Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Chemistry Question

Topic

This multiple-choice question tests Halogen derivatives in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2016 examination, Paper 1 Variant 2.

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