A-LevelChemistryCarboxylic acids and derivativesOct/Nov 2010Paper 1 Q241 Mark

Esters are frequently used as solvents and as flavouring agents in fruit drinks and confectionery. An ester C₈H₁₂Br₂O₄ can be prepared in low yield by the reaction shown. CH₃C(Br)(CH₂Br)CO₂H + (CH₃)₂C(OH)CO₂H = C₈H₁₂Br₂O₄ + H₂O What is the structural formula of the ester C₈H₁₂Br₂O₄?

Q: What is the correct answer to this A-Level Chemistry question?

The correct answer is A: CH₃C(Br)(CH₂Br)CO₂C(CH₃)₂CO₂H.

Q: What topic does this question test?

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

ACH₃C(Br)(CH₂Br)CO₂C(CH₃)₂CO₂H

BCH₃C(Br)(CH₂Br)CO₂C(OH)(CH₃)CO₂CH₃

CCH₃C(Br)(CH₃)CO₂C(CH₃)₂CO₂CH₂Br

D(CH₃)₂C(Br)C(CO₂H)(CH₂Br)CO₂CH₃

✓ Correct Answer

The correct answer is A: CH₃C(Br)(CH₂Br)CO₂C(CH₃)₂CO₂H

📋 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 Carboxylic acids and derivatives in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2010 examination, Paper 1 Variant 2.

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