Solution:
Aniline is a weaker base. It is a Lewis base, i.e. the lone pair present on nitrogen can be given to the Lewis acids. The electron-releasing group present at the para position increases the electron density on nitrogen and thus makes it more basic. For example, para-toluidine is more basic than aniline. On the other hand, the presence of electron-withdrawing group decreases the electron density on nitrogen and hence makes it less basic. For example, p-nitroaniline is less basic than aniline
