Explain why is ortho nitrophenol more acidic than ortho methoxyphenol?


Explain why is ortho nitrophenol more acidic than ortho methoxyphenol?


The nitro-group is an electron-withdrawing group. The presence of this group in the ortho position decreases the electron density in the O−H bond. As a result, it is easier to lose a proton. Also, the o-nitrophenoxide ion formed after the loss of protons is stabilized by resonance. Hence, ortho nitrophenol is a stronger acid.

On the other hand, methoxy group is an electron-releasing group. Thus, it increases the electron density in the O−H bond and hence, the proton cannot be given out easily.

For this reason, ortho-nitrophenol is more acidic than ortho-methoxyphenol.

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Feb. 10, 2023, 5:55 p.m.
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Mind your own business
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