question_answer

Phenol is heated with phthalic anhydride in presence of\[\operatorname{conc}.{{H}_{2}}S{{O}_{4}}\]. The product gives pink colour with alkali. The product is

A)  phenol phthalein           

B)  bake lite

C)  salicylic acid                 

D)  fluorescein

Correct Answer: A

Solution :

Phenol is heated with phthalic anhydride in presence of conc. \[{{H}_{2}}S{{O}_{4}}\] to give phenolphthalein which gives pink colour with alkali