Tests of phenol

            (i) Aqueous solution of phenol provides a violet colouration with a drop of ferric chloride.

         (ii) Aqueous solution of phenol provides a white precipitate of 2, 4, 6-tribromophenol with bromine water.

         (iii) Phenol produces Liebermann's nitroso reaction.

         Phenol in conc. sulphuric acid    Red colour    Blue colour

       (iv) Phenol combines with phthalic anhydride in presence of conc.H₂SO₄ to form phenolphthalein which gives pink colour with alkali, and needed as an indicator.

       (v) With sodium hypochlorite and ammonia, phenol gives blue colour.

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