Write the IUPAC names of the compounds i-iv from their given structures.
`underset(6)CHequivunderset(5)C-underset(4)CH=underset(3)CH-underset(2)CHequivunderset(1)CH_(2)`

Explanation

To determine the IUPAC names of the given compounds (i-iv), we will follow the systematic approach of identifying the longest carbon chain, functional groups, and applying the appropriate naming conventions.

### Step-by-Step Solution:

1. **Identify the Longest Carbon Chain:**
- For compound i, we can see that the longest carbon chain consists of 6 carbon atoms. This is referred to as "hexane."

2. **Identify Functional Groups:**
...