A-LevelChemistryCarboxylic acids and derivativesFeb/Mar 2016Paper 1 Q271 Mark

The fragrance compounds of perfumes are often dissolved in solvent Y, which has a molecular formula C₇H₁₂O₄. It is made by reacting propane-1,2-diol with ethanoic acid in the presence of an acid catalyst. [Figure showing structure of propane-1,2-diol] What is the structure of solvent Y?

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.

AStructural diagram A, an ether-acetal derivative.

BStructural diagram B, an ester with an ether group.

CStructural diagram C, 1,2-diacetoxypropane derived from HOCH₂CH(OH)CH₃.

DStructural diagram D, 1,2-diacetoxypropane derived from HOCH(CH₃)CH₂OH.

✓ Correct Answer

The correct answer is D: Structural diagram D, 1,2-diacetoxypropane derived from HOCH(CH₃)CH₂OH.

📋 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 Feb/Mar 2016 examination, Paper 1 Variant 2.

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