Chemistry 5070 · O Level · Formulae, functional groups and terminology

Formulae, functional groups and terminology — practice question

A student is given three colourless organic liquids, W, X and Y. Of these, one is an alkene, one is an alcohol and one is a carboxylic acid, but the student does not know the identity of each liquid.
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Describe a set of tests that will show which liquid, W, X or Y, is the alkene, which is the alcohol and which is the carboxylic acid. Each liquid should be identified using a positive test. State the apparatus needed, explain how the results identify W, X and Y, and include one safety risk together with a precaution.

Worked solution & mark scheme

This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Aqueous bromine changes from orange/brown/yellow to colourless” …

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