Write the formula of but-1-ene

Explanation

To write the formula of but-1-ene, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Prefix**: The name "but-1-ene" indicates that the compound is an alkene with four carbon atoms (since "but-" refers to four).

2. **Determine the Position of the Double Bond**: The "1-ene" part of the name indicates that the double bond is located between the first and second carbon atoms.

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