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Explain the order of strength of the following acids. p-nitrophenol gt m-nitrophenol gt phenol gt cresol |
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Answer» Solution :p-nitrophenol `gt` m-nitrophenol `gt` phenol `gt` cresol : (a) In aromatic acid, the nitro GROUP (electron withdeawing group) ESPECIALLY at ORTHO or para POSITION increases its strength due to -I effect. (b) So p-nitro phenol is more acidic than m-nitro phenol and it is more acidic than phenol. (C) But cresol contains `CH_(3)` group which has +I effect (electron repelling group) and due to this strength of the acid decreases. So phenol is more acidic than cresol. 
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