Which of the following carbanions are not resonance stabilized?

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Solution

The correct options are
B
D

It is a norborane system having negative charge at the bridge head C-atom. According to Bredt's rule the bridge head C-atom can't form double bond . So, can't participitate in resonance.

In option- D there is no vacant orbital to which the negative charge can move.

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Which of the following molecules is least resonance stabilized ?

(C_{6} H_{5})_{3} C^{-} > C_{6} H_{5} C H_{2}^{-} > a l l y l > C H_{3}^{-} > (C H_{3})_{2} C H^{-}

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