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Kolbe Electrolysis for Alkenes

The compound ...

Question

The compound formed when an alcoholic solution of ethylene dibromide is heated with granulated zinc is:

ethene

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ethyne

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ethane

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bromoethane

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Solution

The correct option is A ethene
The given reaction is dehalogenation reaction. Zinc removes bromine from ethylene dibromide as zinc bromide and forms ethene.
$B r H_{2} C - C H_{2} B r Ethylene dibromide + Z n h e a t - --- \to a l c o h o l H_{2} C = C H_{2} + Z n {B r}_{2}$

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