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?
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. This question tests the candidate's understanding of halogen derivatives within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 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...
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