What is the common name of p-Aminobenzenesulphonamide?

The correct answer is option 3. Sulphanilamide.

The common name of p-Aminobenzenesulphonamide is Sulphanilamide.

p-Aminobenzenesulphonamide: This chemical name describes the molecular structure of the compound, which consists of an amino group \((NH_2)\) attached to the para position of a benzene ring, with a sulphonamide \((SO_2NH_2)\) functional group attached to the benzene ring.

The common name for this compound is "Sulphanilamide." It is also known as "sulphanilamide" or simply "sulphanil." Sulphanilamide is a synthetic antimicrobial agent belonging to the sulfa drug class. It was one of the first commercially available sulfa drugs and played a significant role in the treatment of bacterial infections before the advent of antibiotics like penicillin.