Write IUPAC name of
`CH_3 - CH = underset(CH_3)underset(|)C - underset(Br)underset(|)(CH) - C_2H_5`

Explanation

To write the IUPAC name for the given structure `CH3 - CH = CH(CH3) - C(Br) - C2H5`, we will follow these steps:

### Step 1: Identify and Count the Carbon Atoms
First, we need to identify and count the total number of carbon atoms in the structure.

- The structure shows:
- 1 carbon from CH3
- 1 carbon from CH
...