Wed March 26, 2014 By: Sanskrati Gawande

what happens when

chlorobutane is heated with alcoholic solution of KOH

ethyl bromide is heated with alcoholic potash

ethyl iodide is treated with sodium in dry ether

Expert Reply
Thu March 27, 2014
Dear aakrati

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Topperlearning Team.
  • Alkyl halides on heating with alcoholic potash eliminate one molecule of halogen acid to form alkenes.
  • This reaction is known as dehydrohalogenation i.e. removal of halogen acid.
  • This reaction is an example of β - elimination reaction since hydrogen atom is eliminated from the β carbon atom.


              CH3 - CH2 - CH2 - CH2 –Cl     CH3 - CH2 - CH = CH2    + HCl


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