Engineering
Chemistry
Qualitative analysis of organic compounds
Preparation of phenol
Chemical reactions of phenol
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 350° 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.
Action of neutral ferric chloride on phenol.
