Fundamentholfundamenthol
NEET2026Chemistry
Q.

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

  1. A

    Carboxylic acid

  2. B

    Alcohol

  3. C

    Aldehyde

  4. D

    Phenolic

Solution

The phthalein dye test is used for the identification of phenolic groups: a phenol heated with phthalic anhydride and conc. HSO gives a phthalein dye which shows a characteristic colour with alkali.

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