Draw the structure of 4-isopropyl-2,4,5-trimethylheptane
The Correct Answer and Explanation is:
The structure shown in the image is incorrect for 4-isopropyl-2,4,5-trimethylheptane.
✅ Correct Structure Explanation:
Let’s break down the name 4-isopropyl-2,4,5-trimethylheptane step by step:
1. Parent Chain: Heptane
- The base chain is heptane, which has 7 carbon atoms in a straight chain.
2. Substituents:
- Methyl groups are at positions 2, 4, and 5.
- An isopropyl group is at position 4.
Note: Since both a methyl and an isopropyl are on carbon 4, this carbon will have three bonds to carbon atoms (one to the main chain and two to substituents).
3. Step-by-step structure building:
- Carbon 1 to 7 form the main heptane chain.
- Carbon 2 gets a methyl group.
- Carbon 4 gets both a methyl and an isopropyl group.
- Carbon 5 gets another methyl group.
So, the structure should look like this:
CH3
|
CH3–CH–CH2–C(CH3)(CH(CH3)2)–CH(CH3)–CH2–CH3
| | | |
C2 C3 C4 C5 C6 C7
❌ Why the Image is Incorrect:
In the image:
- The main chain is only 6 carbon atoms long, not 7.
- The isopropyl group appears to be incorrectly positioned.
- Carbon branching doesn’t reflect three substituents (two methyls and one isopropyl) at C4.
✔️ Summary:
Correct IUPAC Structure:
- Main chain: 7 carbon atoms (heptane)
- Substituents:
- Methyl on C2
- Methyl and isopropyl on C4
- Methyl on C5
This ensures 4-isopropyl-2,4,5-trimethylheptane is accurately represented.
