what is IUPAC name for CH3-CH2-CH2-CH2-CH2-C?CH
The Correct Answer and Explanation is:
The IUPAC name for CH₃–CH₂–CH₂–CH₂–CH₂–C≡CH is 1-heptyne.
Explanation:
This compound is a straight-chain alkyne. Let’s go through how to determine its IUPAC name step by step:
1. Identify the longest carbon chain containing the triple bond:
The structure is:
CH₃–CH₂–CH₂–CH₂–CH₂–C≡CH
This is a chain of 7 carbon atoms in total.
Triple bond is between C6 and C7 in the chain (starting count from the end nearest to the triple bond for the lowest possible number).
2. Number the carbon atoms in the main chain:
Start numbering from the end closest to the triple bond to give it the lowest number:
1 → C≡CH
2 → CH₂
3 → CH₂
4 → CH₂
5 → CH₂
6 → CH₂
7 → CH₃
So, the triple bond starts at carbon 1.
3. Identify the suffix for triple bonds:
Alkynes use the suffix –yne. Since the triple bond starts at carbon 1, we use “1-yne”.
4. Identify the base name based on the number of carbon atoms:
Seven carbon atoms correspond to the prefix hept-.
5. Combine the parts:
- Root: hept-
- Triple bond position: 1-yne
Final IUPAC name: 1-heptyne
Additional Notes:
- The triple bond must always be given the lowest possible number in IUPAC naming.
- If there were any side groups or substituents, they would be named and numbered accordingly, but in this case, it is a straight chain with no branches.
- 1-heptyne is an unsaturated hydrocarbon belonging to the alkynes family, with the formula C₇H₁₂.
