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JEE Main levelSingle correct optionDifficulty 2 of 3nm035

What is the IUPAC name of ?

  1. A1,1-dimethylbut-2-yne
  2. B4-methylpent-1-yne
  3. C2-methylpent-3-yne
  4. D4-methylpent-2-yne

Answer: D

The five-carbon chain contains the triple bond. The triple bond gets the lowest locant, which is obtained by numbering from the CH3-C end: the triple bond is at C2 and the methyl at C4. Numbering from the other end would put the triple bond at C3. The name is 4-methylpent-2-yne.
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