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CAIE A-Level Chemistry AS 18.1 Carboxylic Acids Questions

Practise preparing carboxylic acids and writing their metal, base, carbonate, esterification and reduction reactions, explaining acidity and reagent choices in exam contexts.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • prepare an acid by reflux oxidation or by nitrile or ester hydrolysis with the correct work-up
  • write acid reactions with metals, alkalis and carbonates, including salts and gaseous observations
  • select concentrated H2SO4 for esterification or LiAlH4 to reduce the acid to a primary alcohol

Covered syllabus points

18.1.1—Preparation of carboxylic acids18.1.2—Describe

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]

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 2 — CAIE A-Level Chemistry AS
A

1 and 2

B

1 and 3

C

2 and 3

D

3 only

Question 3

[Maximum number: 1]

Which mixtures form a carboxylic acid as one of the products?

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

1, 2 and 3 are correct

B

1 and 2 only are correct

C

2 and 3 only are correct

D

1 only is correct

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