Q. Reaction of phenol with dil. gives

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Solution:

Phenol reacts with dilute nitric acid at room temperature to give a mixture of 2-nitrophenol and 4-nitrophenol. With concentrated nitric acid. With concentrated nitric acid, more nitro groups substitute around the ring to give 2,4,6-trinitrophenol (common name: picric acid).
If phenol is treated with concentrated nitric acid then picric acid is formed. 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.
Solution