A-LevelChemistryHydrocarbonsMay/June 2012Paper 1 Q231 Mark

Isomers X and Y both react with HBr. [Figure 23.1] A mixture of X and Y is reacted with HBr. Which three structures represent three different possible products of this reaction?

Q: What topic does this question test?

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

A(CH3)2CHCBr3 (CH3)2CBrCHBr2 CH3CHBrCHBrCH3

B(CH3)2CHCBr3 (CH3)2CBrCHBr2 CH3CBr2CHBrCH3

C(CH3)2CBrCBr3 (CH3)2CHCBr3 CH3CBr2CHBrCH3

D(CH3)2CBrCHBr2 CHBr2CBr(CH3)CH3 CH3CHBrCBr2CH3

✓ Correct Answer

The correct answer is B: (CH3)2CHCBr3 (CH3)2CBrCHBr2 CH3CBr2CHBrCH3

📋 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 May/June 2012 examination, Paper 1 Variant 2.

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