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CAIE A Level Chemistry 9701 · Carbonyl compounds

Carbonyl compounds: describe question

Describe5 marksStandard

Ethanol is oxidised by heating with an excess of acidified potassium dichromate(VI) and distilling off the product as it forms. The organic product, compound X, is a colourless liquid.

(a) State the identity of compound X and describe the colour change of the dichromate(VI) ion during this reaction. (b) Compound X reacts with hydrogen cyanide in the presence of potassium cyanide and heat. State the type of reaction and write an equation for the reaction of X with HCN. (c) A few drops of compound X are added to a solution of 2,4-dinitrophenylhydrazine reagent. State the observation.

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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.

Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.

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