Write the IUPAC names of the compound:
`CH_3 - CH = CH -CH_2 - CH = CH - undersetoverset(|)(C_2H_5)(C)H - CH_2 - CH = CH_2`

Explanation

To write the IUPAC name of the compound `CH3 - CH = CH - CH2 - CH = CH - C2H5 - CH2 - CH = CH2`, we will follow the steps outlined below:

### Step 1: Identify the Structure
First, we need to visualize the structure of the compound. The compound can be broken down as follows:
- Start with the longest carbon chain.
- The structure includes:
- A straight chain of carbon atoms with double bonds.
- An ethyl group (C2H5) attached to one of the carbon atoms.
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