There are five resonance structures of p-nitroaniline, which is also called 1,4-nitroaniline or 1,4-aminonitrobenzene. The lone pair from the amino group (NH2) can be delocalized around the benzene ring, which gives four different structures, and the electron density can also be delocalized into the nitro group (NO2) which creates a fifth.
Check me out: [ Ссылка ]
