Question:
Which of the following compound gives pink colour on reaction with phthalic anhydride in conc. \( \mathrm{H_2SO_4} \) followed by treatment with \( \mathrm{NaOH} \) ?
Which of the following compound gives pink colour on reaction with phthalic anhydride in conc. \( \mathrm{H_2SO_4} \) followed by treatment with \( \mathrm{NaOH} \) ?
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This test is used to detect the presence of phenolic groups. Phenolphthalein is also one of the most common indicators used in acid-base titrations.
Updated On: Feb 12, 2026
- A
- B
- C
- D
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The Correct Option is A
Solution and Explanation
Step 1: This is the Phthalein dye test.
Step 2: Phenol reacts with phthalic anhydride in the presence of $H_2SO_4$ to form Phenolphthalein.
Step 3: Phenolphthalein is a colorless indicator that turns deep pink/magenta in the presence of an alkali like $NaOH$.
Step 2: Phenol reacts with phthalic anhydride in the presence of $H_2SO_4$ to form Phenolphthalein.
Step 3: Phenolphthalein is a colorless indicator that turns deep pink/magenta in the presence of an alkali like $NaOH$.
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