Which of the following is Zwitter ion of sulphanilic acid?

Step-by-step solution

Sulphanilic acid is p -aminobenzenesulphonic acid, which contains both an acidic group ( -SO₃H ) and a basic group ( -NH₂ ). In aqueous solution or in the solid state, the acidic -SO₃H group donates a proton ( H^+ ) to the basic -NH₂ group. This internal acid-base reaction leads to the formation of a dipolar ion, known as a zwitterion. The resulting zwitterion has a positively charged ammonium group ( -NH₃^+ ) and a negatively charged sulphonate group ( -SO₃^- ) at the para positions of the benzene ring. Looking at