CAIE A Level Chemistry 9701 · Carbonyl compounds

Carbonyl compounds: suggest question

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A student oxidises propan-2-ol with acidified potassium manganate(VII). The mixture is heated gently and the product is collected by distillation as it forms. The student then treats a sample of the product with aqueous alkaline iodine and observes a yellow precipitate. Suggest the reagents, conditions and observations that lead to the yellow precipitate, and state what this tells you about the structure of the product. Give equations for the reaction of the product with hydrogen cyanide.

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7 marks, so the mark scheme is looking for about 7 separate creditworthy points. Making the same point twice in different words earns it once.

Suggest means: Apply what you know to an unfamiliar situation. There may be more than one acceptable answer. Reason from the principle you have learned to the new context, and say which principle you are using.

Carbonyl compounds: suggest question

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