BRAINCAKEFree-Radical Substitution
Alkanes react with halogens such as chlorine in the presence of UV light. A hydrogen atom is replaced by a halogen atom by free-radical substitution. For example: CH4 + Cl2 → CH3Cl + HCl
Initiation: UV light breaks the Cl-Cl bond by homolytic fission to form two chlorine free radicals. Cl2 → 2Cl•
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All 20 lessons in Alkanes · All AQA AS-level Chemistry topics