The above figure represents which of the following options?

Preparation of phenols from sulphonic acid

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Preparation of phenols from benzenesulphonic acid

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Preparation of phenols from sacylic acid

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None of the above

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Solution

The correct option is B Preparation of phenols from benzenesulphonic acid
Sulphonation of benzene with oleum gives benzene sulphonic acid. Neutralisation with aq $N a O H$ converts benzene sulphonic acid to sodium salt.
Dry sodium benzene sulphonate is fused with $N a O H$ (excess) to obtain sodium phenoxide. Treatment with dil. sulphuric acid converts sodium phenoxide to phenol.

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