Chemistry 0620 · IGCSE · Naming organic compounds

Naming organic compounds — practice question

A carboxylic acid and an alcohol combine to make an ester and water. Under some conditions, the process can be carried out in reverse, so an ester reacts with water to give a carboxylic acid X and an alcohol Y. An equilibrium is established. $\text{CH}_3\text{CH}_2\text{COOCH}_3 + \text{H}_2\text{O} \rightleftharpoons X + Y$ The forward reaction absorbs heat.
(a)[1]

Deduce the empirical formula for the ester.

(b)[1]

Name the ester formed.

(c)[2]

Name carboxylic acid X and give its displayed formula.

(d)[2]

Name alcohol Y and state its structural formula.

(e)[4]

Complete Table 4.1 to show the effect, if any, of each change in condition.

(f(i))[2]

Suggest how the pH of the reaction mixture changes from the start of the reaction to the point where equilibrium is reached. Assume alcohols and esters are neutral.

(f(ii))[1]

Identify the ion responsible for the change in pH.

(f(iii))[1]

Name an indicator that can be used to follow the pH change.

Worked solution & mark scheme

This 14-mark question has a full step-by-step worked solution and mark scheme. One marking point: C₂H₄O

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