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JEE Main 2025 Apr 3 Shift 2, Chemistry Q19: Nomenclature of Functional Groups

JEE Main2025Apr 3, Shift 2Chemistry
Q.

What is the correct IUPAC name of

  1. A

    3-Bromo-2-hydroxy-5-nitrobenzoic acid

  2. B

    3-Bromo-4-hydroxy-1-nitrobenzoic acid

  3. C

    2-Hydroxy-3-bromo-5-nitrobenzoic acid

  4. D

    5-Nitro-3-bromo-2-hydroxybenzoic acid

Solution

The principal characteristic group is COOH, so the parent is benzoic acid and the carboxyl carbon is C-1. Number around the ring to give the substituents the lowest locant set.

Numbering to give OH at C-2, Br at C-3, NO at C-5 yields the locant set {2, 3, 5}, which is the lowest possible.

List the substituents alphabetically: bromo, hydroxy, nitro.

The IUPAC name is 3-bromo-2-hydroxy-5-nitrobenzoic acid, option (1). Option (3) lists substituents out of alphabetical order; option (2) assigns a wrong locant to OH and to NO; option (4) is not in alphabetical order.

Concept behind this question

Nomenclature of Functional Groups Notes, formulas and examples →

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