A-LevelChemistryOrganic synthesisMay/June 2022Paper 1 Q351 Mark

The skeletal formula of M is shown. [Figure showing skeletal formula of M, which is CH₃–CH(OH)–C(=O)–CH(OH)–CHO] M is reacted with an excess of LiAlH₄. Dilute acid is then added. What is the molecular formula of the final organic product?

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

The correct answer is D: C₅H₁₂O₅.

Q: What topic does this question test?

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

AC₅H₆O₅

BC₅H₁₀O₄

CC₅H₁₀O₃

DC₅H₁₂O₅

✓ Correct Answer

The correct answer is D: C₅H₁₂O₅

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

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2022 examination, Paper 1 Variant 2.

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