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MHT CET202521 Apr 2025Morning ShiftChemistryGeneral Organic ChemistryActual

Which from following functional groups has highest priority order for naming the polyfunctional group compounds?

Options

  1. A- COCl
  2. B- SO ₃ H
  3. C- CHO
  4. D- OH

Correct answer

B. - SO ₃ H

Step-by-step solution

According to IUPAC nomenclature, the principal functional group in polyfunctional compounds is determined by a priority hierarchy. Functional groups are ranked as follows: carboxylic acids ( - COOH ), sulfonic acids ( - SO₃ H ), acid anhydrides, esters, acid halides ( - COCl ), amides, nitriles, aldehydes ( - CHO ), ketones, alcohols ( - OH ), and amines. Given the options, the sulfonic acid group ( - SO₃ H ) holds the highest priority at rank 2, making it the principal functional group.

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