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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 questions.

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]

Which equation represents a reaction that proceeds through initiation, propagation and termination steps?

A

C4H10+Cl2→C4H9Cl+HCl\mathrm{C}_{4} \mathrm{H}_{10}+\mathrm{Cl}_{2} \rightarrow \mathrm{C}_{4} \mathrm{H}_{9} \mathrm{Cl}+\mathrm{HCl}

B

C5H11Br+NaOH→C5H11OH+NaBr\mathrm{C}_{5} \mathrm{H}_{11} \mathrm{Br}+\mathrm{NaOH} \rightarrow \mathrm{C}_{5} \mathrm{H}_{11} \mathrm{OH}+\mathrm{NaBr}

C

C6H12+H2O→C6H13OH\mathrm{C}_{6} \mathrm{H}_{12}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{C}_{6} \mathrm{H}_{13} \mathrm{OH}

D

C6H13CHO+HCN→C6H13CH(OH)CN\mathrm{C}_{6} \mathrm{H}_{13} \mathrm{CHO}+\mathrm{HCN} \rightarrow \mathrm{C}_{6} \mathrm{H}_{13} \mathrm{CH}(\mathrm{OH}) \mathrm{CN}

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