MolSynapsequestion bank
MolSynapse / Question bank / IUPAC Nomenclature and Structural Isomerism / Functional group priority in drawn compounds
JEE Advanced levelSingle correct optionDifficulty 3 of 3nm244

What is the IUPAC name of the compound shown? Numbering starts from the principal group.

  1. A4-oxopent-2-enoic acid
  2. B3-oxopent-1-en-5-oic acid
  3. C3-oxopent-4-enoic acid
  4. D3-oxopentanoic acid

Answer: C

The compound is 3-oxopent-4-enoic acid. The acid is principal (C1), then the ketone is a prefix oxo at C3 and the double bond lies at C4. Numbering from the vinyl end (pent-1-en-5-oic acid) breaks the rule that the principal group gets C1.
Practice IUPAC Nomenclature and Structural Isomerism More on Functional group priority in drawn compounds
Previous questionNext question

More questions on Functional group priority in drawn compounds