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Phenol reacts with conc. H₂SO₄ at 25°C to form phenol-2-sulfonic acid (2-hydroxybenzenesulfonic acid) as the major product due to ortho substitution.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Physical Properties and Acidity of Alcohols and Phenols
2,4,6-Trinitrophenol (picric acid), formed by nitrating phenol with conc. HNO₃, is used as an explosive due to its high reactivity.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Classification and Nomenclature and Structures of Alcohols Phenols Ethers
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