Write the IUPAC name of the compound having the formula `CH_3-CH=CH-CH_3` .

Explanation

To determine the IUPAC name of the compound with the formula `CH3-CH=CH-CH3`, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Longest Carbon Chain**:
- The given formula is `CH3-CH=CH-CH3`.
- Count the number of carbon atoms in the longest continuous chain. Here, there are 4 carbon atoms.

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