Arrange the following in the order of basicity :
c > a > b
b > a> c
a > b > c
a > c > b
All the given bases are aromatic amines having their lone pairs in conjugation with the Benzene ring.
Among the given bases, " a" is most basic because of methyl at the para position and "c" is least basic because it shares lone pair with both phenyl rings.
Therefore, the correct order of basic strength of the given aromatic amines follow the order:
(a) > (b) > (c)
Hence, option number (3) is correct.