Write the IUPAC names of the compounds (i-iv) from their given structures
(i) `{:(overset(1)(C)H_(3)-overset(2)(C)H_(2)-overset(3)(C)H-overset(4)(C)H_(2)-overset(5)(C)H_(2)-overset(6)(C)H-overset(7)(C)H_(2)-overset(8)(C)H_(3)),(" |"" |"),(" "OH" "CH_(3)):}`
(ii) `overset(6)(C)H_(3)-overset(5)(C)H_(2)-overset(O)overset("4||")(C)-overset(3)(C)H_(2) overset(2)(-)overset(O)overset(||)(C)-overset(1)(C)H_(3)` (iii) `overset(6)(C)H_(3)-overset(O)overset("5||")(C)-overset(4)(C)H_(2)-overset(3)(C)H_(2)-overset(2)(C)H_(2)-overset(1)(C)OOH`
(iv) `Hoverset(6)(C)-=overset(5)(C)-overset(4)(C)H=overset(3)(C)H-overset(2)(C)H=overset(1)(C)H_(2)`

Explanation

To write the IUPAC names of the given compounds, we will analyze each structure step by step.

### (i)
1. **Identify the longest carbon chain**: The structure shows a chain of 8 carbon atoms.
2. **Identify functional groups**: There is an -OH (hydroxyl) group on the 3rd carbon and a -CH₃ (methyl) group on the 6th carbon.
3. **Number the carbon chain**: Start numbering from the end closest to the -OH group to give it the lowest possible number. The chain is numbered as follows:
- 1 - CH₃
- 2 - CH₂
...