Why ortho and para nitrophenols are more acidic than phenols.

Asked by  | 19th Feb, 2013, 12:40: AM

Expert Answer:

The nitro-group is an electron-withdrawing group. The presence of this group in the ortho or para position decreases the electron density in the O?H bond. As a result, it is easier to lose a proton. Also, the o-nitrophenoxide or p-nitrophenoxide ion formed after the loss of protons is stabilized by resonance. Hence, ortho and para nitrophenols are stronger acids than phenol.

Answered by  | 19th Feb, 2013, 12:22: PM

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