Suggest the most important type of intermolecular attractive interaction in the following pairs : (i) n-hexane and n-octane (ii) `I_2` and` "CCl"_4` (iii) `NaClO_4` and water (iv) methanol and acetone (v) acetonitrile `(CH_3CN)` and acetone `(C_3H_6O).`

Explanation

(i) Both are non-polar. Hence, intermolecular interactions will be London dispersion forces.
(ii) Same as (i).
(iii) `NaClO_4` gives `Na^+` and `ClO_4^-` ions in the solution and water is a polar molecule. Hence, intermolecular interactions will be ion-dipole interactions.
(v) Same as (iv).