COMEDK Exam 2015 Solved Paper

Aniline is less basic than ammonia and aliphatic amines due to delocalisation of lone pair of electrons on the benzene ring.
Aliphatic amines are stronger bases, than ammonia due to +I-effect of alkyl group. More the number of alkyl groups stronger is the base.
Hence, basic strength will follow the following order
(C2H5)2‌NH>C2H5NH2>NH3>C6H5NH2