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Q.

Which one of the following carbanions is the least stable ?

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a

${CH}_{3} {CH}_{2}^{-}$

b

$HC \equiv C^{-}$

c

$(C_{6} H_{5}) C^{-}$

d

${CH}_{3}^{-}$

answer is A.

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Detailed Solution

Stability of carbanion $α$ % s – character of carbanionic in option ‘a’ ${CH}_{3} - \overset{⊙}{C} H_{2}$ is ${sp}^{3}$ hybridization

% Of s – character is low so least stable.

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