Chemistry - GOC Question with Solution | TestHub

Benzyl carbanion is stabilized by resonance.

electron-releasing groups (+I groups) make the carbanion less stable. Thus, a primary carbanion is more stable than secondary carbanion, which in turn, is more stable than a tertiary, because of +I effect associated with alkyl groups. Decreasing order of stabilities of carbanion is

Electron-attracting groups (-I groups) like$-\mathrm{N}{\mathrm{O}}_2,-\mathrm{B}\mathrm{r}$will stabilize carbanion by partial removal of the negative charge on the carbon.