Pyrolysis of benzene sulphonic acid to form phenol is by:

combustion

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double displacement

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addition-elimination

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both A and B

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Solution

The correct option is D addition-elimination
An aryl sulphonic acid yields the corresponding phenol on heating it with molten sodium hydroxide at $570 - 620 K$ . The reaction occurs via the addition-elimination mechanism with $S O_{3}^{2 -}$ functioning as the leaving group.

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Compound A on sulphonation with oleum forms benzene sulphonic acid, which on heating with NaOH and acidification yields phenol. What is Compound A?

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