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Substitution

OCR A-level Organic ChemistryReactions and Reactive SpeciesLesson 8 of 20

In a substitution reaction an atom or group of atoms in a molecule is replaced by a different atom or group.

In free radical substitution, alkanes react with chlorine or bromine in ultraviolet light and a hydrogen atom is replaced by a halogen atom, for example CH4 + Cl2 → CH3Cl + HCl.

Diagram

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