Phenol ⟶ conc. H2SO4A⟶ conc. HNO3BHere A and B are respectively

Sulphonation is a reversible process, henece at high temperature SO3H groups are lost and nitration will occur.

Sulphonation is a reversible process, henece at high temperature SO3H groups are lost and nitration will occur.

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$Phenol \overset{conc. H_{2} {SO}_{4}}{⟶} A \overset{conc. {HNO}_{3}}{⟶} B$
Here A and B are respectively

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P–Hydroxy benzenesulphonic acid, P–nitrophenol

4–Hydroxybenzene–1,3–disulphonic acid, picric acid

4–Hydroxybenzene-1,3–disulphonic acid, 2,4–dinitrophenol

3–Hydroxybenzenesulphonic acid, picric acid

answer is B.

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Sulphonation is a reversible process, henece at high temperature SO₃H groups are lost and nitration will occur.

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