Question

(CH3)2NH is more basic than (CH3)3N in an aqueous solution.. Why.???
On the basis of electron donating.

Answer 1

In aqueous solution the solvent readily donates a proton which is accepted by either base to form it's conjugate acid... In case of secondary and tertiary amine the conjugate acid is stabilized or destabilized by three factors I. E, Inductive effect, hydrogen bonding and streric repulsion... All these favour 2ndary amine to be the strongest base... Now if the alkyl group is large order will be, secondary amine >tertiary amine > primary amine