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Question

Prepare carbolic acid from benzene sulphonic acid. Write a chemical equation for the action of neutral ferric chloride on phenol.

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Solution

Preparation of carbolic acid (phenol) from benzene sulphonic acid:
Treatment of benzene sulphonic acid with NaOH gives sodium salt of benzene sulphonic acid. This sodium salt is heated with NaOH at 3500 to form sodium salt of phenol. The acid hydrolysis of sodium salt gives phenol.
The action of neutral ferric chloride on phenol gives violet coloured complex.

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