We can see from the table 2 that the systems with large deviations from the benchmark numbers are also associated with r α >> 1. Therefore for stacking complexes the error in QDO interaction energies can be attributed to errors in fragmentations. For rest of the complexes, small under-estimatation of vdW interaction energy is observed. Notably, the interaction energy for pentane dimer and benzene-ethene complexes are underestimated by 1 kcal/mol. Overall, these large deviations in dispersion interactions can be attributed to the lack of Axilrod-Teller-Muto (ATM) 60,61 correction and higher order attractive correction terms. Note that most of our corrections has opposite signs than that of PBE-D2 in contrast to electrostatically bound cases discussed before. While it is difficult to pinpoint the reasons for this observation, we can guess that the inclusion of higher order terms may eventually correct for this discrepancy. From statistical viewpoint, both -D2 and QDO dispersion correction reduces the error of PBE (Table -3), while -D2 method is slightly better than QDO corrections.