Considering only the +I effect of alkyl groups, which carbanion is the most stable?

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

Answer: D

Alkyl groups donate electrons and intensify the negative charge on carbon, destabilising a carbanion. The methyl anion has no alkyl group and is the most stable; the order is

CH X_{3} X^{-} >

primary

>

secondary

>

tertiary.

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