CAIE A Level Chemistry 9701 · Carbonyl compounds
A laboratory has two unlabelled bottles, each containing a colourless liquid. One is propanal and the other is propanone. Suggest how you could distinguish between the two liquids, using chemical tests only. Include the reagents and conditions for each test and the observations you would expect for each liquid.
6 marks, so the mark scheme is looking for about 6 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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