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Action of Water on Calcium Carbide

State the con...

Question

State the conditions required for the following reactions to take place:
Preparation of ethyne from ethylene dibromide

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Solution

Ethyne is prepared from ethylene dibromide by reacting is with hot conc. alcoholic KOH.
The reaction can be given as follow:
$C H_{2} B r - C H 2 B r + K O H \to C H B r = C H_{2} + K B r$
$C H B r = C H_{2} + N a N H_{2} \to C H \equiv C H + N a B r + H_{2}$

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