A-LevelChemistryReaction kinetics9701/12 · Oct/Nov 2013 · Q71 Mark

Which stage in the free radical substitution of methane by chlorine will have the lowest activation energy?

ACH3• + Cl2 → CH3Cl + Cl•

BCl• + Cl• → Cl2

CCl• + CH4 → CH3• + HCl

DCl2 → Cl• + Cl•

✓ Correct answer

B: Cl• + Cl• → Cl2

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Topic: Reaction kinetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2013 Paper 1 Variant 2, question 7.

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