A-LevelChemistryAnalytical techniques9701/12 · May/June 2022 · Q341 Mark

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

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

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

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Topic: Analytical techniques, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2022 Paper 1 Variant 2, question 34.

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