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CAIE A-Level Chemistry A2 33.2 Esters Questions

Practise preparing esters from acyl chlorides and interpreting ester structures, hydrolysis and synthesis routes.

Syllabus
2028–2030
Course
Chemistry 9701
Level
A2

Exam points

  • convert a carboxylic acid to its acyl chloride before reaction with an alcohol or phenolic compound
  • draw the ester linkage with the acid-derived acyl side and alcohol- or phenol-derived oxygen side
  • use hydrolysis products and follow-up tests to distinguish structures instead of relying on molecular formula

Covered syllabus points

33.2.1—Preparation of esters

Question 1

[Maximum number: 1]

P can be used to make compound Q in a single step reaction.

Figure for Question 1 — CAIE A-Level Chemistry A2

Give the structural formula of the compound that is added to P to make Q and give the formula of the other product of this reaction.
compound added to P
other product

Question 2

[Maximum number: 3]

Tyrosine and lysine, shown in Fig. 9.1, are naturally occurring amino acids found in proteins.

Fig. 9.1

Fig. 9.1

When ethanoic acid is treated with PCl5\mathrm{PCl}_{5} product D is formed.

When D is added to tyrosine two different isomeric products, E and F, are formed.
E has an ester linkage, F does not.
Draw the structures of D, E and F in the boxes below.
D

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