Why primary cảrbanions are more stable than the secondary and tertiary carbanions ?

Explanation

The order of stability of carbạnions can be explained on the basis of +I effect. The alkyl group is an electron releasing group with +I effect. It increases the electron density on the – vely charged carbon atom. Since the electron releasing tendency of carbon increases. It increases the reactivity of negatively charged carbon atom. Thus, the greater the number of alkyl groups, the greater will be the reactivity and lesser will be the stability. Thus, the order of the stability of different carbanions is : Primary `gt` Secondary `gt` Tertiary.