Picric acid is formed when phenol react with which of the following reactant?

Picric acid is formed when phenol react with which of the following reactant? Correct Answer Nitric acid

Nowadays picric acid is prepared by treating phenol first with concentrated sulfuric acid which converts it to phenol-2,4-disulfuric acid and then with concentrated nitric acid to get 2,4,6-trinitrophenol.
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