Write the structural formula of 4-chloro-2-pentene.

Explanation

To write the structural formula of 4-chloro-2-pentene, we will follow these steps:

### Step 1: Identify the Parent Chain
The name "pentene" indicates that the parent chain consists of five carbon atoms. The "2" in "2-pentene" indicates that there is a double bond between the second and third carbon atoms.

### Step 2: Number the Carbon Atoms
We will number the carbon atoms in the chain from left to right:
- C1 - C2 - C3 - C4 - C5
...