Classification and nomenclatureMedium

Question

The functional group that can be identified through phthalein dye test is:

Options

A.Aldehyde
B.Phenolic
C.Carboxylic acid
D.Alcohol

Solution

Sol. [Key Concept: Phthalein dye test identifies phenols]

Phthalein Dye test: Phenol on heating with phthalic anhydride in presence of concentrated sulphuric acid forms a colourless condensation compound called phenolphthalein. On further reaction with NaOH it gives pink colour.

So phenolic group is correct Ans..

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