Kinetic acidities of arenes, ArH, measured some time ago by hydrogen isotope exchange kinetics with lithium cyclohexylamide (LiCHA) in cyclohexylamine (CHA) show a wide range of reactivities that involve several electronic mechanisms These experimental reactivities give an excellent Bronsted correlation with equilibrium lithium ion pair acidities (pK(Li)) derived as shown recently from computations of ArLi center dot 2E (E = dimethyl ether). The various electronic mechanisms are well modeled by ab initro HF calculations with modest basis sets Additional calculations using NH3 as a model for CHA further characterize the TS of the exchange reactions The slopes of Bronsted correlations of ion pair systems can vary depending on the nature of the ion pairs