According to IUPAC rules, if there is a choice in numbering due to identical locant sets for multipl — IUPAC and Nomenclature Chemistry Question
Question
According to IUPAC rules, if there is a choice in numbering due to identical locant sets for multiple bonds, the double bond is given preference over the triple bond. What is the correct name for $HC \equiv C - CH_2 - CH = CH_2$?
Answer: A
💡 Solution & Explanation
Numbering from either end gives the locant set (1, 4) for the multiple bonds. In such tie situations, the double bond ($C=C$) receives the lower number. Therefore, numbering must start from the right end, making it Pent-1-en-4-yne.
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