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CAIE A-Level Chemistry 15.1.1 Preparation of Halogenoalkanes

Practise selecting free-radical, electrophilic-addition or alcohol-substitution routes to halogenoalkanes.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • halogenate an alkane with Cl2 or Br2 under UV light, accepting that a product mixture may form
  • add X2 or gaseous HX to an alkene at room temperature to form the relevant halogenoalkane
  • replace alcohol –OH using HX, KCl/acid, PCl3, PCl5 or SOCl2 with the required conditions

15.1.1—Preparation of halogenoalkanes question 1

[Maximum number: 1]

Allyl chloride is an important chemical used in the manufacture of plastics, pharmaceuticals and pesticides.

allyl chloride

allyl chloride

Allyl chloride can be produced by many different methods. The most common method is chlorination of propene which proceeds via a free-radical substitution mechanism.

Figure for Question 15.1.1—Preparation of halogenoalkanes question 1 — CAIE A-Level Chemistry AS

Allyl chloride can also be formed by the following substitution reaction.

Figure for Question 15.1.1—Preparation of halogenoalkanes question 1 — CAIE A-Level Chemistry AS

Suggest the identity of reagent X.

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