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Explain dehydrohalogenation of a alkyl h...

Explain dehydrohalogenation of a alkyl halide.

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When alkyl halides are heated with alcoholic potash dehydrohalogenation takes place giving alkenes. In this reaction, halogen is removed from the `alpha` - carbon while hydrogen is removed from the `beta`-carbon. Hence it is `beta`-elimination reaction.
`CH_(3) - underset("1 - Bromopropane(Propyl bromide)")(CH_(2) - CH_(2) - Br) + KOH_(alc) overset(" " Delta " ")(rarr) CH_(3) - underset("Propene")(CH) = CH_(2) + KBr + H_(2)O`
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