Brønsted-Evans-Polanyi (BEP) relationships have been important in providing a semiempirical correlation between the reaction's intrinsic energy barriers and the Gibbs free energy change. We plotted the intrinsic energy barriers of the three crucial steps i.e., ∆G ‡ 1 (energy of activation from B to BC), ∆G ‡ 2 (energy of activation from D to DE) and ∆G ‡ 3 (energy of activation from E to EF), as a function of the Gibbs free energy of reaction for these respective steps (∆G r1,r2,r3 ) as shown in Figure . Here, and illustrates the overall trend of the BEP relationships, considering the variation of both active and spectator atoms. The correlation coefficients for the three steps are relatively low, at 0.77, 0.62, and 0.79, respectively.