Edexcel A-Level Chemistry A2 15.13 The Nomenclature of Acyl Chlorides and Esters Questions

Split each ester into its alcohol-derived alkyl group and acid-derived carboxylate part, then use the same fragments to draw structures or identify acyl-chloride reactants.

Exam points

Name an ester by identifying its alcohol-derived alkyl group and acid-derived carboxylate part.
Draw structural or skeletal formulae for straight-chain, branched, cyclic and multi-ester compounds from their names or reactants.
Deduce the alcohol and acyl chloride reactants from an ester structure, or work backwards from the product name.

[Maximum number: 2]

This question is about reactions of carboxylic acids and their derivatives.

(a)

Molecule A reacts in two ways in the presence of an acid catalyst.

molecule A

Reaction 1 is intramolecular, in which one molecule of A forms a cyclic ester B.
Reaction 2 is intermolecular, in which a condensation polymer C forms.

[ 1 ]

(i)

Draw the structure of the cyclic ester B.

[ 1 ]

(b)

The molecule shown is a triester, used as a food additive.

Figure for Question (b) — Edexcel A-Level Chemistry A2

[ 1 ]

(i)

Give the molecular formula of this triester.

[ 1 ]

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Edexcel A-Level Chemistry A2 15.13 The Nomenclature of Acyl Chlorides and Esters Questions question 1

Question (a)

Question (i)

Question (b)

Question (i)