Give the systematic IUPAC names of the following compounds :
`CH_3 - overset(C_2 H_5) overset(|) CH - CH = CH - underset(CH_2) underset(||) underset(CH) underset(|) (CH) - CH_2 CH_3`

Explanation

To determine the systematic IUPAC name of the given compound, we will follow a step-by-step approach:

### Step 1: Identify the Longest Carbon Chain
First, we need to identify the longest continuous carbon chain in the molecule. This chain should include all the functional groups, specifically the double bonds.

### Step 2: Number the Carbon Chain
Next, we will number the carbon chain. The numbering should start from the end that gives the lowest numbers to the double bonds. In this case, we will find that numbering from one side gives us double bonds at positions 1 and 4, while numbering from the other side gives us double bonds at positions 3 and 6. Since 1 and 4 are lower, we will use this numbering.

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