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
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- 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