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JEE Main levelSingle correct optionDifficulty 2 of 3el226

The compound shown is a sulpha drug. Which pair of nitrogen-containing groups does it contain?

  1. AAn amide and a primary aromatic amine
  2. BA secondary amine and a sulphonic acid
  3. CA nitro group and a sulphonamide
  4. DA primary aromatic amine and a primary sulphonamide

Answer: D

The compound shown is sulphanilamide (4-aminobenzenesulphonamide). The ring bears a free aromatic NH2 and an SO2NH2 group, which is a primary sulphonamide. No nitro or carbonyl amide group is present.
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