$P h C H C l B r t B u O^{-} \to$ Carbene

In the given reaction which of the following will be intermediate, most probable?

_{∙}^{∙} C H B r

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_{∙}^{∙} C H C l

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_{∙}^{∙} C P h B r

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_{∙}^{∙} C P h C l

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Solution

The correct option is D $_{∙}^{∙} C P h C l$
$P h C H C l B r t B u O^{-} \to - t \cdot B u O H P h C^{-} C l B r \to P h ∙ ∙ C C l$ .

First the $t B u - O^{-}$ abstracts the proton and after that as $B r^{-}$ is good leaving group so it leaves.

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