Halogenation of Alkenes

  1. Alkenes undergo addition reaction with halogen such as fluorine, chlorine, bromine and iodine.
  2. Since this is the reaction with the halogens, hence it is also called the halogenation reaction.
  3. Equation below shows the addition reaction between ethene and bromine.
  4. When ethane gas is bubbled into bromine liquid, the brown colour bromine turn colourless.
  5. The product produced is 1,2-dibromoethane.
  6. If chlorine gas is used instead of bromine, the yellow colour of chlorine water will be decolourised.


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