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CAIE A-Level Chemistry A2 33.3.1 Preparation of Acyl Chlorides Questions

Practise preparing acyl chlorides from carboxylic acids, selecting reagents and conditions, identifying structures and completing reaction equations.

Syllabus
2028–2030
Course
Chemistry 9701
Level
A2

Exam points

  • Select PCl₃ with heat, PCl₅ or SOCl₂ to convert a carboxylic acid into its acyl chloride.
  • Draw the acyl chloride product, or identify its acid precursor, keeping the carbon skeleton unchanged.
  • Complete preparation equations with HCl and the correct additional product: POCl₃ or SO₂.
  • Balance reagent and by-product amounts when excess SOCl₂ reacts with more than one susceptible group.

CAIE A-Level Chemistry A2 33.3.1 Preparation of Acyl Chlorides Questions question 1

[Maximum number: 3]

Benzene can be used to make benzoic acid in the two-step process shown in Fig. 7.1.

Fig. 7.1

Fig. 7.1

When treated with a chlorine-containing reagent under suitable conditions, benzoic acid forms compound L.

When treated with a different chlorine-containing reagent under different conditions, benzoic acid forms compound M.

Suggest and draw structures of compounds L and M in the boxes. The molecular formula of each product is given.

Table for Question CAIE A-Level Chemistry A2 33.3.1 Preparation of Acyl Chlorides Questions question 1 — CAIE A-Level Chemistry A2

State the reagents and conditions to form compound M from benzoic acid.

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