Q. The correct order of the increasing basicity of methyl amine, ammonia and aniline is
Amines
Solution:
In aniline the lone pair on N is involved in delocalization with benzene ring and is not available for protonation. Methyl amine is a stronger base than ammonia because +I effect of methyl group increases electron density on N making it more basic than $NH_3$.
Cannot be protonated. least basic
$\underset{\text{ +I Effect increases basicity. }}{ CH_2 \rightarrow - NH_2 } $
