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Question
Give the method of preparation of ethyne by 1, 2-dibromoethene.
Solution
When 1,2-dibromoethane (ethylene dibromide) is boiled with alcoholic potassium hydroxide, ethyne is formed.
\[\ce{\underset{ethylene dibromide}{CH2Br2 - CH2Br} + \underset{alcoholic}{2KOH} ->[200^\circ C][boiling] \underset{ethyne}{CH ≡ CH} + 2KBr + 2H2O}\]
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