CAIE A-Level Chemistry 18.2 Esters Question Bank

Practise forming, naming and breaking ester links from structural formulae, reagents, hydrolysis conditions and product tables.

Exam points

choose the alcohol and carboxylic acid that form a named or drawn ester
identify hydrolysis products under dilute acid or aqueous alkali from an ester structure

Covered syllabus points

18.2.1—Preparation of esters 18.2.2—Hydrolysis of esters by dil. acid and by dil.

[Maximum number: 2]

$4\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCHO}$ is used in the synthesis of some antibiotics.

Two reaction sequences are shown.

Figure for Question 18.2 Esters question 1 — CAIE A-Level Chemistry AS

Draw the structure of the organic molecule T that reacts with $\mathbf{A},\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCO}_{2} \mathrm{H}$ , in reaction 2, to form U.

Suggest a catalyst for reaction 2.
T
catalyst

Figure for Answer to Question 18.2 Esters question 1 — CAIE A-Level Chemistry AS

/ $\mathrm{CH}_{3} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{3}$

M2: $\mathrm{H}_{2} \mathrm{SO}_{4}$ / sulfuric acid

[Maximum number: 2]

Allyl chloride is an important chemical used in the manufacture of plastics, pharmaceuticals and pesticides.

allyl chloride

A series of reactions starting from allyl chloride is shown.

Figure for Question 18.2 Esters question 2 — CAIE A-Level Chemistry AS

The organic product of reaction 3 is Y.
Y can be hydrolysed using excess aqueous $\mathrm{H}_{2} \mathrm{SO}_{4}$ to form Z.
The molecular formula of Z is $\mathrm{C}_{4} \mathrm{H}_{8} \mathrm{O}_{4}$ .
Draw the structure of Z.

All question bank results loaded

Covered syllabus points

18.2 Esters question 1

18.2 Esters question 2