what is the IUPAC name for CH3-CH2-CH2-CH2-CH2-C?CH
The Correct Answer and Explanation is:
Correct Answer: The IUPAC name for CH₃–CH₂–CH₂–CH₂–CH₂–C≡CH is hept-1-yne.
Explanation:
The given compound is a straight-chain hydrocarbon with a triple bond. Here’s how to determine the IUPAC name step-by-step:
1. Count the total number of carbon atoms:
- CH₃ (1 carbon)
- CH₂ (4 carbons)
- C≡CH (2 carbons total: one triple-bonded carbon and one terminal carbon with hydrogen)
Total = 7 carbon atoms
This gives the root name as hept, which indicates seven carbon atoms.
2. Identify the functional group:
- The C≡CH represents a terminal alkyne (a triple bond at the end of the chain).
- Alkynes are named with the suffix -yne.
3. Number the carbon chain to give the triple bond the lowest possible number:
- Numbering starts from the end closest to the triple bond.
- In this molecule, the triple bond begins at carbon 1 (if you start numbering from the end with the triple bond).
- Therefore, the correct position of the triple bond is 1.
4. Combine the components:
- Hept (7 carbon atoms)
- 1-yne (triple bond starting at carbon 1)
This results in the IUPAC name hept-1-yne.
Summary:
This compound is a seven-carbon alkyne where the triple bond starts at carbon 1. Naming follows IUPAC rules which prioritize the lowest position for the triple bond and use standard prefixes based on carbon chain length. There are no substituents or branches in this structure, so the name remains simple and direct: hept-1-yne.
