Question

Write the IUPAC name of \(\text{CH}_3-\text{C}\equiv\text{CH}\).

Hint:

For small chains like propene or propyne, numbering the double/triple bond is not strictly necessary as there's only one possible structural isomer for the bond placement.

Answer 1

Step 1: Understanding the Concept:
IUPAC naming requires counting the longest carbon chain and identifying functional groups or multiple bonds.

Step 2: Detailed Explanation:
The given structure is \(\text{H}_3\text{C}-\text{C}\equiv\text{CH}\).
1. Count carbons: The longest continuous carbon chain has 3 carbon atoms. The root word for 3 carbons is "prop".
2. Identify bonds: There is a triple bond between carbon atoms. The suffix for a triple bond is "-yne".
3. Numbering: Number the chain from right to left to give the triple bond the lowest possible number (position 1). However, since there are only 3 carbons, the triple bond must be between C1 and C2 regardless of which end it is on. Thus, the position number (1) is often omitted.
Combining these gives Prop + yne.

Step 3: Final Answer:
The IUPAC name is Propyne.