With the aim of demonstrating these equations on chemical systems, we were interested in studying the kineticthermodynamic relationship of a suitable family of reactions that evidently manifests the three parameters we defined. To see nonlinearity clearly, the reactions should display easily modulated driving forces over a wide range of energies while retaining the same orbital makeup. For these reasons, we explored a 1,2hydride shift on a vinyl cation, a system adapted from a reported reaction. In order to determine the energies associated with this process, we performed density functional theory (DFT) calculations on the system. The reported energies were calculated, in the gas phase, in ORCA 6.0 20 using the dispersion-corrected 21 ωB97X-D3 functional and the def2-TZVPPD basis set 23 for all atoms, with the RIJCOSX 24 approximation. 25 A family of 1,2diarylethenyl cations was calculated with substitution on one of the aryl rings, together with the corresponding 1,2-hydride shift transition states and their products (Scheme 1).