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  4. Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives

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Q. Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives

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Solution:

Solution
The reaction of phenol with concentrated nitric acid in the presence of sulphuric acid, however, is a tri-nitration reaction. the product is 2,4,6-trinitrophenol (commonly called picric acid ). If phenol is treated with dilute nitric acid, mono or disubstituted nitrophenols are formed. o-nitrophenols are more stable than p-nitrophenols due to intramolecular hydrogen bonding.