Which of the following method is not used in the preparation of acetylene :

Dehydrohalogenation

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Dehalogenation

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Hydrolysis

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Hydrogenation

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Solution

The correct option is D Hydrogenation
Alkyne can be produced by
Kolbe electrolysis:
acetylene can be produced by electrolysis of aq. solution of sodium/potassium maleate or fumarate.
Dehydrohalogenation:
Preparation of alkyne by heating ethylene bromide with alc. KOH followed by sodamide in ammonia solution.
Synthesis:
$2 C + H_{2} \to C_{2} H_{2}$ at high temp.
and by hydrolysis.

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