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  4. Ethylene dibromide on treating with alcoholic KOH gives

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Q. Ethylene dibromide on treating with alcoholic $KOH$ gives

Hydrocarbons

Solution:

Alkynes can be prepared by dehydrohalogenation of alkyl dihalides
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Ethylene dibromid Vinyl bromide Acetylene Vinyl bromide being less reactive and thus to get better yield a stronger base $NaNH_2$ is used in second step.