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Dehydrohalogenation for Alkenes

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Question

Give the method of preparation of ethyne from 1, 2-dibromoethane.

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Solution

When 1,2 -dibromoethane is boiled with alcoholic potassium hydroxide, ethyne is formed.

$C H_{2} B r - C H_{2} B r + K O H B o i l i n g - --- \to C H \equiv C H + 2 K B r + 2 H_{2} O$

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