Halogenation

Edexcel AS-level ChemistryAlkenesLesson 5 of 19

Alkenes react readily with the halogens chlorine and bromine at room temperature. The halogen molecule adds across the C=C bond, with one halogen atom joining each carbon, to form a dihalogenoalkane. The two halogen atoms end up on neighbouring carbon atoms.

CH₂=CH₂ + Br₂ → CH₂BrCH₂Br

The product is 1,2-dibromoethane. In the same way, propene and chlorine give 1,2-dichloropropane, CH₃CHClCH₂Cl.

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Halogenation

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