(i) n-Hexane and n-octane : London dispersion forces as both themolecules are non-polar.(ii) $\mathrm{I}_2$ and $\mathrm{CCl}_4$ : London dispersion forces as both the molecules are non-polar.(iii) $\mathrm{NaClO}_4$ and water : Ion-dipole interactions as $\mathrm{NaClO}_4$ in water gives$\mathrm{Na}^{+}$and $\mathrm{ClO}^{-4}$ Ions. These ions interact with polar water molecules.(iv) Methanol and acetone : Dipole-dipole interactions as both themolecules are polar.(v) Acetonitrile and acetone : Dipole-dipole interactions as both themolecules are polar.