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The reliability of several density functional theory (DFT) functionals and of the Möller-Plesset second-order perturbation theory calculations with modified basis sets (mp2mod) approach in describing cation-π interactions is systematically investigated by benchmarking their performances with respect to high quality reference CCSD(T) calculations of the binding energies between alkaline cations of varying radius (Na+, K+, Rb+, and Cs+) and three aromatic species (benzene, phenol, and catechol). For this class of noncovalent interaction, m