Which of the following is least stable carbanion

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Solution

The correct option is C

The stability of carbanion is measured in terms of pka values of their conjugate acids. Lower the pka value stronger is the acid and more stable is the carbanion

$H C \equiv C H (25); (C_{6} H_{5})_{3} C H (31.5), C H_{4} (48), (C H_{3})_{3} C H (. > 51) T h u s (C H_{3})_{3} C^{-}$ is least stable.

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