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NEET levelSingle correct optionDifficulty 1 of 3g1203

Which of the following carbanions is stabilised by resonance?

A $CH X_{3} X^{-}$
B $(CH X_{3}) X_{3} C X^{-}$
C $^{-} CH X_{2} - CHO$
D $CH X_{3} CH X_{2} X^{-}$

Answer: C

In

^{-} CH X_{2} - CHO

the lone pair is conjugated with the C=O group:

^{-} CH X_{2} - CH = O \leftrightarrow CH X_{2} = CH - O X^{-}

, placing the charge on electronegative oxygen. The alkyl carbanions have no conjugation.

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