A-LevelChemistryHydrocarbonsFeb/Mar 2023Paper 1 Q391 Mark

Cyclohexa-1,4-diene is treated with a solution of bromine in tetrachloromethane in the dark. [Figure 39.1: Structure of cyclohexa-1,4-diene.] Which product is formed?

Q: What topic does this question test?

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

ACyclic six-membered ring with two Br on adjacent carbons and one double bond remaining. (1,2-dibromocyclohex-4-ene)

BCyclic six-membered ring with four Br atoms, all single bonds. (1,2,4,5-tetrabromocyclohexane)

CCyclic six-membered ring with two Br atoms on carbons separated by one carbon, and one double bond remaining. (1,4-dibromocyclohex-2-ene)

DCyclic six-membered ring with four Br atoms on adjacent carbons, all single bonds. (1,2,3,4-tetrabromocyclohexane)

✓ Correct Answer

The correct answer is B: Cyclic six-membered ring with four Br atoms, all single bonds. (1,2,4,5-tetrabromocyclohexane)

📋 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 Hydrocarbons in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Feb/Mar 2023 examination, Paper 1 Variant 2.

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