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Introduction To Organic Chemistry


Halogenation of Alkenes

Halogenation of alkenes yield disubstituted alkanes. Please bear in mind that this halogenation is quite different from when there is a halogenation of alkanes. The halogenation of alkenes is an addition reaction whilst that of alkane is a substitution reaction.

Halogenation is the test that is carried out for unsaturation. The halogen or its solution (CCl4 or H2O) is quickly decolourized in dim light. For example, below bromine adds to give 1,2-dibromoethane.

Ethene + Bromine 1,2-dibromoethane