Q. When phenol is heated with phthalic anhydride and $H_{2}SO_{4}$, it produces
A) Phenol red
B) Methyl orange
C) Salicylic acid
D) Phenolphthalein
Explanation
(d)
In the presence of conc. $H_{2}SO_{4}$, two molecules of phenol condense with phthalic anhydride to form phenolphthalein
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Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.