NEET 2026 Chemistry Functional Group Identification MCQ Question with Solution

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

A

Aldehyde

B

Phenolic

C

Carboxylic acid

D

Alcohol

Correct Answer

Option B

Detailed Explanation

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 answer.

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