IUPAC name of CH ≡ C - CH = CH₂ is:

• A. But-3-en-1 yne
• B. But-1-en-3-yne
• C. But-1-yn-3-ene
• D. But-3-yn-1-ene

The compound CH≡C-CH=CH₂ is an example of an alkyne and alkene combination. To determine its IUPAC name, we need to analyze the structure carefully.

Structure Breakdown

This compound has a total of four carbon atoms. The triple bond (≡) is between the first and second carbon atoms, while a double bond (=) is between the third and fourth carbon atoms. The longest carbon chain includes both types of bonds.

Identifying the Correct Name

• But-3-en-1-yne: Indicates a double bond at carbon 3 and a triple bond at carbon 1.
• But-1-en-3-yne: Indicates a double bond at carbon 1 and a triple bond at carbon 3.
• But-1-yn-3-ene: Indicates a triple bond at carbon 1 and a double bond at carbon 3.
• But-3-yn-1-ene: Indicates a triple bond at carbon 3 and a double bond at carbon 1.

Final Answer

The correct IUPAC name for CH≡C-CH=CH₂ is But-1-yn-3-ene (Option C). This name accurately reflects the positions of the triple and double bonds in the molecule.