Catechol on heating with phthalic anhydridee in the presence of conc. `H_(2)SO_(4)` gives `:`

When phenol is heated with phthalic anhydride in the presence of conc. H_(2)SO_(4) , the product is :

Phenol when condensed with phthalic anhydride in the presence of conc. H_(2)SO_(4) , yields ,

Phenol is heated with phthalic anhydride in the presence of conc. H_(2)SO_(4) . The product gives pink colour with alkali. The product is

Phenol is heated with phthalic anhydride in the presence of conc. H_(2)SO_(4) . The product gives pink colour with alkali. The product is

Decomposition of oxalic acid in the presence of conc. H_(2)SO_(4) gives

Which of the following compound undergoes condensation with phthalic anhydride in the presence of hot concentrated H_(2)SO_(4) to form phenolphthalein?

Acetic acid on warming with hydrazoic acid in presence of conc. H_(2)SO_(4) gives :

Acetic acid on warming with hydrazoic acid in presence of conc. H_(2)SO_(4) gives