[en] Rate constants for solvolysis involving the displacement of chloride from the carbonyl carbon of diphenylacetyl chloride ((C₆H₅₎2CHCOCl, 1) in ethanol, methanol, aqueous binary mixtures incorporating ethanol, methanol, acetone, 2,2,2-trifluoroethanol (TFE), and 1,1,1,3,3,3-hexafluoro-2-propanol, and binary mixtures of TFE with ethanol are reported. The kinetic data obtained from the reactions in 34 different solvents and solvent mixtures gave an extended Grunwald–Winstein correlation with the l value of 0.76 ± 0.06, the m value of 0.34 ± 0.04, and the correlation coefficient (R²) of 0.932. The appreciable values for both l and m suggest that the bond formation is ahead of the bond breaking with an S_N2 mechanism, and the l/m ratio of 2.2 is also in the range of values found for S_N2 reaction. This interpretation is further supported by the activation parameters, i.e., relatively small positive ΔH^≠ (7.7–16.3 kcal/mol) values and large negative ΔS^≠ (−24.6 to −53.4 cal/mol/K) values, and the solvent kinetic isotope effect (1.62)