Amines and it's strengths

Question

Comment on the relative base strengths of the different nitrogen containing compounds. Can you explain why phenyl amine has a lower base strength than the other compounds? (Define a base; this might help…)

Answer 1

A Base should be a good electron donor.

In Phenyl Amine the lone pair of electrons on Nitrogen is busy in resonance with the phenyl ring, So not available to donate.Therefore It is a weak base.

So More availability of lone pair electrons to donate will make a Nitrogen containing compound a strong base.