Ultrasonic velocities (U) and densities (p) for binary liquid mixtures of acetophenone with 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2,2-tetrachloroethane, trichloroethene and tetrachloroethene were determined over the whole composition range at 303.15 K. Isentropic compressibilities (ks) and deviation in isentropic compressibilities (Ks) were computed from experimental sound velocities and densities. The experimental data were used to explain the effect of successive chlorination and unsaturation on ethane molecules.