Suggest the most important type of intermolecular attractive interaction in the following pairs `:`
`a. n-`Hexane and `n-`octane
`b. I_(2)` and `C Cl_(4)`
`c. NaClO_(4)` and water
`d.` Methanol and acetone
`e.` Acetonitrile `(CHM_(3)CN)` and acetone `(C_(3)H_(6)O)`

Explanation

To solve the problem of identifying the most important type of intermolecular attractive interaction in the given pairs, we will analyze each pair step by step.

### Step 1: Analyze n-Hexane and n-Octane
- **Structures**: n-Hexane (C6H14) and n-Octane (C8H18) are both non-polar hydrocarbons.
- **Intermolecular Forces**: Since both are non-polar, the primary intermolecular force present is **Van der Waals forces** (or London dispersion forces).

**Answer for Part a**: Van der Waals attraction.

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