Identify electron-donating groups in resonance among the following.

Find the number of electron - donating groups in resonance among the following : {:("a) "-CONH_(2), "b) "-NO_(2), "c) "-OCOCH_(3), "d) "-COOCH_(3)), ("e) "-CHO, "f) "-NHCOCH_(3),"",""):}

Identify electron - withdrawing groups in resonance among the following :

All aliphatic amines are more basic than ammonia but due to delocalization of lone pair of electrons of the nitrogen atom on the benzene ring, aniline is a weaker base than ammonia. The basic strength of the substituted anilines, however, depends upon the nature of the substituent. Whereas electron-donating groups tend to increase, electron-withdrawing groups tend to decrease the basic strength. The base strengthening effect of the electron-donating groups and base weakening effect of the electron-withdrawing groups is, however ,more pronounced at p-than at m-position. However, due to ortho effect, o-substituted anilines are weaker bases than anilines regardless of the nature of substituent whether electron-donating or electron-withdrawing. Among the following, the weakest base is

Identify the mismatch among the following.