(A) Lewis base is defined as a species that can donate a lone pair of electrons.In the reaction $I_2 + I^{-} \rightarrow I_3^-$,the iodide ion $(I^{-}

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(A) Lewis base is defined as a species that can donate a lone pair of electrons.In the reaction $I_2 + I^{-} \rightarrow I_3^-$,the iodide ion $(I^{-})$ has a lone pair of electrons which it donates to the iodine molecule $(I_2)$ to form the triiodide ion $(I_3^-)$.Therefore,$I^{-}$ acts as the Lewis base and $I_2$ acts as the Lewis acid.