question_answer

Phenol is heated with pthalic anhydride in presence of cone. \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\text{.}\]The product gives pink colour with alkali. The product is:

A)  phenolphthalein            

B)  bakelite

C)  salicylic acid                      

D)  fluorescein

Correct Answer: A

Solution :

Phenol and phthalic anhydride on heating in presence of cone. \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\]produce    phenolphthalein   which produce pink colour with alkali.