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Explain why is ortho nitrophenol more acidic than ortho methoxyphenol ? |
Answer» Solution :`to` The acidic property of PHENOL arises from the loss of hydrogen of -OH group of phenol as `H^(+)`. This loss of is favoured if the polarity of the O-H bond increases and hydrogen becomes more electropositive. The presence of electron WITHDRAWING groups such as `-NO_(2)` increases the polarity of O-H bond and THUS the acidic strength of the phenol is raised. On the contrary, the `-OCH_(3)` is an electron releasing group and it decreases the polarity of O-H bond and thus MAKES the release of `H^(+)` difficult. This can be understood by the RESONATING structures : 
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