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.

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

[Maximum number: 1]

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

$\mathrm{C}_{4} \mathrm{H}_{10}+\mathrm{Cl}_{2} \rightarrow \mathrm{C}_{4} \mathrm{H}_{9} \mathrm{Cl}+\mathrm{HCl}$

$\mathrm{C}_{5} \mathrm{H}_{11} \mathrm{Br}+\mathrm{NaOH} \rightarrow \mathrm{C}_{5} \mathrm{H}_{11} \mathrm{OH}+\mathrm{NaBr}$

$\mathrm{C}_{6} \mathrm{H}_{12}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{C}_{6} \mathrm{H}_{13} \mathrm{OH}$

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

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