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JEE Advanced levelSingle correct optionDifficulty 3 of 3nm097

A benzene ring bears a -COOH group and a -CONH group in the 1,4 (para) positions. The IUPAC name is:

  1. A4-formylbenzamide
  2. B4-carbamoylbenzoic acid
  3. C4-aminobenzoic acid
  4. D4-carboxybenzamide

Answer: B

The acid outranks the amide. The compound is therefore a benzoic acid and the -CONH2 group is expressed as the prefix carbamoyl on C-4. The name is 4-carbamoylbenzoic acid (4-carboxybenzamide ranks the amide above the acid, which is wrong).
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