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Question

The intermediate formed in E1cB reaction is a

A
carbanion
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B
carbocation
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C
free radicle
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D
benzyne
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Solution

The correct option is A carbanion
In E1cB reaction the compound must have an acidic hydrogen on its β carbon and a relatively poor leaving group on the α carbon.
The base abstracts the β - proton and generates negative charge on the carbon atom to form carbanion.

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