Question

The IUPAC name of the given organic compound is HC \( \equiv \) C - CH = CH - CH\(_2\).

• A. Hexa - 5-yn-1,3-diene
• B. Hexa-1,3-dien-5-yne
• C. Hexa - 3,5-dien-1-yne
• D. Hexa-1-yn-3,5-diene

Hint:

When naming organic compounds, identify the longest chain with the highest-priority functional groups and number it to give the lowest locants to the functional groups.

Answer 1

The Correct Option is B

To determine the IUPAC name of this compound, we need to follow the systematic nomenclature rules for alkenes, alkynes, and conjugated systems. - First, we identify the longest carbon chain containing both a double and triple bond. This is a 6-carbon chain (hexane). - We then number the carbon chain starting from the side closest to the functional group. Here, the triple bond is at position 1, and the double bonds are at positions 3 and 5. - The compound contains a triple bond at position 1 (yne), double bonds at positions 3 and 5 (diene), and the appropriate suffixes for each. Thus, the correct IUPAC name is Hexa-1,3-dien-5-yne, corresponding to option (2). \[ \text{Correct IUPAC Name: Hexa-1,3-dien-5-yne.} \]