Data on density, speed of sound, and viscosity for mixtures of oxolane with 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2,2-tetrachloroethane, trichloroethene, and tetrachloroethene at 303.15 K are reported. The results are used to derive isentropic compressibility (k(s)), deviations in isentropic compressibility (Delta k(s)), and deviations in viscosity (Delta ln eta) Values of hh, are positive in mixtures of oxolane with 1,2-dichloroethane and tetrachtoroethene and negative in the systems oxolane + 1,1,1-trichloroethane, + 1,1,2,2-tetrachloroethane, and + trichloroethene. All the systems exhibit positive deviation in viscosity. The results are interpreted in terms of electron-donor-acceptor interactions between unlike molecules.