CAIE A Level Chemistry 9701 · Carbonyl compounds
A colourless liquid, X, has the molecular formula . It reacts with 2,4-dinitrophenylhydrazine reagent to form an orange precipitate, but it does not react with Tollens' reagent. Suggest two chemical tests, other than the 2,4-DNPH test, that you could carry out to identify X as propanone rather than propanal. For each test, state the reagent(s) and conditions, and the expected result for propanone.
5 marks, so the mark scheme is looking for about 5 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.
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