Dichloro(2,2’-bipyridyl)Ni(II) in nitrobenzene did not show an increase in molar conductance with time suggesting no solvent path in the present system. In the presence of nucleophilic reagent such as CH3COCl the conductance increased sharply owing to the substitution of bipyridine by chloride ions. Plot of
  Δ ΔΔ against time was linear suggesting first order kinetics. The results show that the rate of substitution is independent of the concentration of the nucleophile and depends only on the first power of the concentration of the complex