A-LevelChemistryAnalytical techniquesMay/June 2022Paper 1 Q341 Mark

Which reaction has a product that gives a yellow precipitate when treated with alkaline I₂(aq)?

Q: What topic does this question test?

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

A2-chloropropane is warmed with a dilute aqueous solution of sodium hydroxide.

BEthanal is heated under reflux with acidified potassium dichromate(VI).

CMethyl ethanoate is heated under reflux with dilute sulfuric acid.

DPropanal is reacted with NaBH₄, followed by dilute sulfuric acid.

✓ Correct Answer

The correct answer is A: 2-chloropropane is warmed with a dilute aqueous solution of sodium hydroxide.

📋 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 Analytical techniques 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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