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

Explanation

The resonance structure of o- and p nitrophenoxide ions and phenoxide ion are given below:

It is evident from the above structures that due to -R-effect of the `-NO_(2)` group, o- and p-nitrophenoxide ions are more stable (because of additional resonance structures, III and IX enclosed in boxes) than phenoxide ion. as a result, o- and p-nitrophenols are more acidic than phenol.