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What is the IUPAC name of ?

  1. Abut-1-yne
  2. Bbut-2-yne
  3. Cbut-1-ene
  4. Dbut-3-yne

Answer: A

The four-carbon chain with a triple bond is a butyne. Number from the end that gives the triple bond the lower locant, so the triple bond starts at C1. The name is but-1-yne, not but-3-yne.
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