question_answer 77)

  Out of o-nitrophenol and o-cresol which is more acidic ?

Answer:

                  Due to -1 and- R-effect of the  group, electron density in the O?H bond decreases while due to +1 or hyper conjugation effect, of the  group, the electron density in the O?H bond increases. As a result, O?H bond is o-nitrophenol is much weaker than the O?H bond is o-cresol and hence o-nitrophenol is much more acidic than o-cresol.