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Which of the following reagents may be used to distinguish between phenol and benzoic acid ?

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Which of the following reagents may be used to distinguish between phenol and benzoic acid ? 

(a) Aqueous NaOH 

(b) Tollen’s reagent 

(c) Molisch reagent 

(d) Neutral FeCl3

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(d) : Phenol gives violet colouration with neutral ferric chloride solution. Benzoic acid gives buff coloured (pale dull yellow) precipitate with neutral ferric chloride solution.

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