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Explain dehydrohalogenation of dihalides...

Explain dehydrohalogenation of dihalides.

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Alkynes are prepared by dehydrohalogenation of vicinal dihalides using alcoholic solution of potassium hydroxide.
`underset(((1,2-diromoethane)))underset("Ethylene dibromide")underset(CH_(2)-Br)underset(|)(CH_(2) - Br) + 2KOH_(a//c) overset(" "Delta" ")(rarr) underset("ethyene")(CH equiv) CH + 2KBr + 2H_(2)O`
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