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CAIE A-Level Chemistry 33.1.2 Converting Carboxylic Acids to Acyl Chlorides

Practise selecting PCl₃, PCl₅ or SOCl₂ and drawing the acyl chloride formed from a carboxylic acid.

Syllabus
2028–2030
Course
Chemistry 9701
Level
A2

Exam points

  • replace the carboxylic acid’s –OH within –COOH by Cl while retaining the carbonyl group
  • use PCl5 or SOCl2, or PCl3 with heat, as a reagent for forming an acyl chloride
  • convert both –COOH groups of a dicarboxylic acid when excess reagent forms a dioyl chloride

33.1.2—Carboxylic acids to acyl chlorides question 1

[Maximum number: 2]

Fig. 6.1 shows two reactions of ethanedioic acid, HOOCCOOH .

Fig. 6.1

Fig. 6.1

Question (a)

(a)

Draw the organic product G in the box in Fig. 6.1.

[ 1 ]

Question (b)

(b)

In Fig. 6.1, SOCl2\mathrm{SOCl}_{2} is given as the reagent that reacts with HOOCCOOH to produce G.

Identify a different reagent that also reacts with HOOCCOOH to produce G.

[ 1 ]
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