Statement I :  ${\mathrm{I}}_2+{\mathrm{I}}^{-}\to {\mathrm{I}}_3^{-}$ In this reaction I₂ is Lewis acid.

Statement II : Electron pair donor is Lewis acid

Instantaneous dipole formation occurs in non polar melecules which are often favoured by large size. I^- donates a pair of electron to I₂ and I₃^- ion is formed. Electron pair donor is a lewis base.