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CAIE A-Level Chemistry AS 18 Carboxylic Acids and Derivatives Questions

Practise preparing and reacting carboxylic acids and converting among acids, esters and related derivatives, writing equations with appropriate reagents, conditions and products.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Covered syllabus points

18.1 Carboxylic acids18.2 Esters

Question 1

[Maximum number: 1]

Which reaction will form propanoic acid?

A

acidic hydrolysis of propyl ethanoate

B

alkaline hydrolysis of ethyl propanoate

C

acidic hydrolysis of propanenitrile

D

acidic hydrolysis of ethanenitrile

Question 2

[Maximum number: 1]

Two compounds, X and Y, are mixed and a little concentrated H2SO4\mathrm{H}_{2} \mathrm{SO}_{4} is added.
Ester Z is found in the resulting mixture of products.

Figure for Question 2 — CAIE A-Level Chemistry AS

Which two compounds could be X and Y ?

X

Y

CH3CH2OH\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}

CH(CO2H)3\mathrm{CH}\left(\mathrm{CO}_{2} \mathrm{H}\right)_{3}

CH3CH2OH\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}

CH3CO2CH2CH(OH)CH2OCOCH2CH3\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{CH}_{2} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{2} \mathrm{OCOCH}_{2} \mathrm{CH}_{3}

CH3CO2H\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{H}

CH3CH2CO2CH2CH(OH)CH2OH\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CO}_{2} \mathrm{CH}_{2} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{2} \mathrm{OH}

CH3CO2H\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{H}

CH2(OH)CH(OH)CH2(OH)\mathrm{CH}_{2}(\mathrm{OH}) \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{2}(\mathrm{OH})

Question 3

[Maximum number: 1]

P is a carboxylic acid with molecular formula C5H10O2\mathrm{C}_{5} \mathrm{H}_{10} \mathrm{O}_{2}.
Carboxylic acid P reacts with an excess of LiAlH4\mathrm{LiAlH}_{4} to form compound Q.
Which pairs of molecules could be carboxylic acid P and compound Q ?

Table for Question 3 — CAIE A-Level Chemistry AS
A

1 and 2

B

1 and 3

C

2 and 3

D

3 only

Question 4

[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?

A

CH3CO2CH2CH2OH\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}

B

CH3CO2CH2CH2CO2H\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CO}_{2} \mathrm{H}

C

CH3CH2CO2CH2CH2CH3\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CO}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}

D

CH3CH2CH(OH)CH(OH)CH2CH3\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{2} \mathrm{CH}_{3}

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