Due to the electron releasing nature of alkyl group, it (R) pushes
electrons towards nitrogen and thus makes the unshared electron
pair more available for sharing with the proton of the acid Moreover,
the substituted ammonium ion formed from the amine gets stabilised
due to dispersal of the positive charge by the +I effect of the alkyl
group Hence, alkylamines are stronger bases than ammonia Thus, the basic nature of aliphatic amines should increase with
increase in the number of alkyl groups