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CAIE A-Level Chemistry AS 14.1.3 Mechanism Free Radical Substitution Questions

Practise labelling initiation, propagation and termination, writing radical equations and explaining ultraviolet initiation for alkane free-radical substitution in CAIE 9701…

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • label the initiation, propagation and termination stages in a free-radical substitution mechanism
  • write propagation equations showing hydrogen abstraction by a halogen radical followed by reaction of the carbon radical with Cl2 or Br2
  • write a valid termination equation by combining radicals and use ultraviolet light to explain initiation

CAIE A-Level Chemistry AS 14.1.3 Mechanism Free Radical Substitution Questions 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 CAIE A-Level Chemistry AS 14.1.3 Mechanism Free Radical Substitution Questions question 1 — CAIE A-Level Chemistry AS

The propenyl radical, CH2=CHCH2\mathrm{CH}_{2}=\mathrm{CHCH}_{2}, is formed in the first propagation step of the reaction. Write an equation to show the formation of CH2=CHCH2∙\mathrm{CH}_{2}=\mathrm{CHCH}_{2}{ }^{\bullet} in this propagation step.

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