What is the IUPAC name for the hydrocarbon CH₃-C≡C-CH₂-CH₃?

  1. Pent-3-yne
  2. Pent-2-yne
  3. Pentyne
  4. 2-pentyne

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The longest chain has 5 carbons (pent-). The triple bond starts at the 2nd carbon to give the lowest possible number.
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