Chemistry 9701 · AS & A Level · Carboxylic acids and derivatives

Carboxylic acids and derivatives — practice question

A number of esters found naturally are used as flavourings in food.
(a(i))[1]

The displayed structure of ester V is shown. Give the name of V.

(a(ii))[1]

V reacts with a reagent to make a salt of a carboxylic acid and an alcohol. Identify a reagent that could be used in this reaction.

(a(iii))[1]

Draw the displayed formula of the alcohol formed in this reaction.

(a(iv))[1]

State one other possible use of V, other than as a food flavouring.

(b(i))[3]

Ester W contains $54.5\%$ carbon, $9.1\%$ hydrogen and $36.4\%$ oxygen. Calculate the empirical formula of W.

(b(ii))[1]

State what extra information is needed to find the molecular formula of W.

(c(i))[1]

Compounds X, Y and Z are shown. They all share the same molecular formula. Deduce the molecular formula of X, Y and Z.

(c(ii))[2]

In three experiments, sodium is added to separate samples of X, Y and Z. Complete the table with the observations for each experiment. Ignore any temperature changes that may happen. Na + X Na + Y Na + Z

(d)[1]

Methanoic acid reacts with sodium carbonate solution. Write the equation for this reaction.

Worked solution & mark scheme

This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: n-propyl ethanoate

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