CAIE A-Level Chemistry AS 18.2 Esters Questions

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: 1]

Two compounds, X and Y, are mixed and a little concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ is added.
Ester Z is found in the resulting mixture of products.

Figure for Question 1 — CAIE A-Level Chemistry AS

Which two compounds could be X and Y ?

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$

$\mathrm{CH}\left(\mathrm{CO}_{2} \mathrm{H}\right)_{3}$

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$

$\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{CH}_{2} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{2} \mathrm{OCOCH}_{2} \mathrm{CH}_{3}$

$\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{H}$

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CO}_{2} \mathrm{CH}_{2} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{2} \mathrm{OH}$

$\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{H}$

$\mathrm{CH}_{2}(\mathrm{OH}) \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{2}(\mathrm{OH})$

[Maximum number: 1]

Compound Q can be hydrolysed by HCl(aq). The two products of this hydrolysis have the same empirical formula.

What could Q be?

$\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}$

$\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CO}_{2} \mathrm{H}$

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CO}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}$

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{2} \mathrm{CH}_{3}$

[Maximum number: 1]

An alcohol, X, reacts with a dicarboxylic acid, Y, to form a double ester, Z.
The diagram shows the structure of the ester.

Which row about the reactants forming ester Z is correct?

the class of

alcohol X

the shape of

the ring in Y

secondary

non-planar

secondary

planar

tertiary

non-planar

tertiary

planar

All question bank results loaded

Covered syllabus points

Question 1

Question 2

Question 3