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JEE Main levelSingle correct optionDifficulty 2 of 3nm225

What is the IUPAC name of the compound shown? The parent chain must contain the double bond and be as long as possible.

  1. A2-propylbut-1-ene
  2. B3-methylhex-1-ene
  3. C2-ethylpent-1-ene
  4. D2-methylhex-1-ene

Answer: C

The compound is 2-ethylpent-1-ene. The longest chain that includes the C=C has 5 carbons (CH2=C-CH2CH2CH3), leaving an ethyl group on C2. 2-Propylbut-1-ene picks a shorter chain containing the double bond.
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