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How will you show whether a given -OH gr...

How will you show whether a given -OH group is alcoholic or phenolic ?

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Phenols give violet colouration with neutral ferric chloride solution while alcohols don.t give violet
`underset(Phenol)(3C_(6)H_(5))OH+FeCl_(3)rarrunderset("Ferric phenoxide (violet)")((C_(6)H_(5)O_(3))Fe+HCl)`
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