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CAIE A-Level Chemistry AS 14.1.2 Describe Questions

Practise balancing complete and incomplete alkane combustion equations and describing chlorine or bromine free-radical substitution under ultraviolet light in CAIE 9701 questions.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • write balanced equations for complete combustion of an alkane to carbon dioxide and water, and for incomplete combustion to carbon monoxide or carbon
  • state chlorine or bromine with ultraviolet light for free-radical substitution of an alkane and write the overall substitution equation
  • recognise further substitution and product mixtures when excess halogen reacts with ethane or methane rather than assuming one product

CAIE A-Level Chemistry AS 14.1.2 Describe Questions question 1

[Maximum number: 1]

Which reaction occurs when ethane and chlorine are mixed in diffused sunlight?

A

a free-radical substitution with hydrogen given off

B

a free-radical substitution with hydrogen chloride given off

C

a free-radical substitution with no gas given off

D

a nucleophilic substitution with hydrogen chloride given off

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