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Periodicity

Which of the ...

Question

Which of the following carbanion is least stable?

M e - O - ⊖ C H_{2}

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P h - ⊖ C H_{2}

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C H_{2} = C H - ⊖ C H_{2}

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Solution

The correct option is A $M e - O - ⊖ C H_{2}$
In (b), (c) and (d), carbanion is stabilised by resonance, but in (a) it is slightly stabilised by -I effect of $O$ atom. Hence (a) is least stable.

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