Ortho and para nitrophenols are more acidic than phenol. Draw the resonance structures of the corresponding phenoxide ions.

Explanation

The resonating structures of phenoxide ion and ortho and para nitrophenoxide ions are :


It is clear from the above structurs that due to -I effect of `-NO_(2)` group, 0- and nitrophenoxid ions are more stabtle becuase they have additional resoance structures (IV.) and (V..) then phenoxide ion. Hence o- and p-nitrophenols more acidic than phenol.