Write the structure of isobutylene ?

Explanation

To write the structure of isobutylene, we can follow these steps:

### Step 1: Identify the Carbon Backbone
Isobutylene is derived from butane, which has four carbon atoms. The prefix "iso" indicates a branched structure.

### Step 2: Draw the Carbon Skeleton
We start by drawing the four carbon atoms. In isobutylene, the carbon skeleton can be represented as follows:
```
...