Three bottles of colourless liquids labelled F, G and H contain separate pure samples of the compounds ethanal, propanal or propanone but not necessarily in that order.

1. (a)State the functional group in ethanal, propanal and propanone.[1]
2. (b)State a reagent and the relevant observation that confirm that F, G and H have the same functional group. reagent observation[2]
3. (c)(i)Separate samples of F, G and H are each tested with Tollens' reagent and with alkaline I2(aq). The observations are shown in Table 6.1. Table 6.1 Tollens' reagent alkaline I2(aq) F no observable change pale yellow precipitate G silver mirror pale yellow precipitate H silver mirror no precipitate Use Table 6.1 to name the organic compounds in bottles F, G and H. F = G = H =[2]
4. (c)(ii)Identify the yellow precipitate produced when alkaline I2(aq) is added to separate samples of F and G.[1]
5. (c)(iii)Compound J does not contain the same functional group as F, G and H. Compound J also reacts with alkaline I2(aq) to produce a pale yellow precipitate. Suggest the structure of compound J.[1]