The order of basic strength of \\\\(C_6H_5NH_2(1),\\\\) \\\\(C_2H_5NH_2(2),\\\\) \\\\((C_2H_5)_2NH(3),\\\\) and \\\\(NH_3(4)\\\\) is \\\\(1 < 4 < 2 < 3\\\\) or \\\\(C_6H_5NH_2(1) < NH_3(4) < C_2H_5NH_2(2) < (C_2H_5)_2NH(3)\\\\)The basicity of aniline is lower than the basicity of ammonia as in aniline, the lone pair of electrons on N is involved in resonance with benzene ring. Ethyl amine and diethyl amine are more basic than ammonia due to presence of electron releasing ethyl groups (+I effect) which increases electron density on nitrogen due to which the lone pair of electrons on nitrogen can be easily donated.