question_answer

Phenol is heated with pthalic anhydride in presence of cone. \[{{H}_{2}}S{{O}_{4}}\]. 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. \[{{H}_{2}}S{{O}_{4}}\] produce    phenolphthalein    which produce pink colour with alkali.