MHT CET 2025 Chemistry question

Which of the following reagents is used in the conversion of phenol into picric acid?

(A)dil.
(B)dil.
(C)conc. + conc. Correct
(D)conc.

Answer: (C)

Solution

Picric acid is 2,4,6-trinitrophenol. The group strongly activates the ring towards electrophilic substitution at the ortho and para positions. Treating phenol with a nitrating mixture of conc. and conc. introduces three groups:

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Question ID VK-102660