MolSynapsequestion bank
MolSynapse / Question bank / IUPAC Nomenclature and Structural Isomerism / Nomenclature of alkanes, alkenes, alkynes and cyclic compounds
JEE Main levelSingle correct optionDifficulty 2 of 3nm033

What is the IUPAC name of ?

  1. A3-methylpent-2-ene
  2. B3-methylpent-3-ene
  3. C2-ethylbut-2-ene
  4. D2-methylpent-3-ene

Answer: A

The longest chain containing the double bond has five carbons. The double bond must receive the lowest locant, so the chain is numbered from the CH3-CH= end, giving pent-2-ene with the methyl on C3. The name is 3-methylpent-2-ene.
Practice IUPAC Nomenclature and Structural Isomerism More on Nomenclature of alkanes, alkenes, alkynes and cyclic compounds
Previous questionNext question

More questions on Nomenclature of alkanes, alkenes, alkynes and cyclic compounds