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Question

Phenol is heated with phthalic anhydride in presence of conc. H2SO4. The product gives pink colour with alkali. The product is:
  1. bakelite
  2. salicyclic acid
  3. phenolphthalein
  4. fluorescein

A
salicyclic acid
B
bakelite
C
phenolphthalein
D
fluorescein
Solution
Verified by Toppr

Phenol is heated with phthalic anhydride in presence of conc. H2SO4. The product gives a pink colour with alkali. The product is phenolphthalein. In acidic medium phenolphthalein is colourless. It is used as an indicator of acid-base titration.

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