Which of the following intermediates is formed during the preparation of phenol from benzene sulphonic acid?

Sodium ethoxide

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Potassium phenoxide

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Sodium phenoxide

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None

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Solution

The correct option is A Sodium phenoxide
Benzenesulphonic acid is treated with molten sodium hydroxide at high temperature which leads to the formation of sodium phenoxide. Finally, sodium phenoxide on acidification gives phenols.
Hence option C is correct.

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