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How does the nitration of phenol with di...

How does the nitration of phenol with dilute nitric acid differ from nitration of phenol with conc, nitric acid in the presence of sulphuric acid?

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Phenol react with dilute nitric acid at low temperature to give a mixture of ortho and para nitrophenol.

Nitrogen of phenol under drastic conditions give 2, 4, 6 Trinitrophenol or picric acid. When phenol is nitrated with a mixture of conc. `HNO_3` in the presence of sulphuric acid, picric acid is the main product. However, the yield is quite less due to oxidation of phenol with conc. `HNO_3`
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