Write the structure of 4-chloro-2-ethyl 1-butene.

Explanation

To write the structure of 4-chloro-2-ethyl-1-butene, we will follow these steps:

### Step 1: Identify the main chain
The name "1-butene" indicates that we have a butene, which consists of 4 carbon atoms in a straight chain. The "1" indicates that the double bond is located between the first and second carbon atoms.

**Hint:** Remember that "but" indicates 4 carbon atoms.

### Step 2: Determine the position of the double bond
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