What is the structure of isobutyl group in an organic compound?

Explanation

To determine the structure of the isobutyl group in an organic compound, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Isoalkyl Groups**: The term "iso" in isoalkyl groups indicates a specific structural arrangement. An isoalkyl group has one terminal carbon atom (CH3) and a branching point that leads to another carbon chain.

2. **Identifying the Carbon Count**: The isobutyl group is derived from butane (which has four carbon atoms). The "iso" prefix indicates that there is a branching in the carbon chain.

3. **Drawing the Structure**:
- Start with the terminal carbon (CH3).
- The next carbon (C) is connected to the terminal carbon.
- The third carbon (C) is connected to the second carbon.
- The fourth carbon (CH2) is connected to the third carbon, creating a branch.

4. **Final Structure**: The structure of the isobutyl group can be represented as follows:
```
CH3
|
CH3-CH-CH2
```
In this structure, the isobutyl group has a total of four carbon atoms, with a branching point at the second carbon.