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Excess volumes and sound velocities for binary liquid mixtures of acetophenone with n-alcohols and ialcohols are measured at 303.15 K. The sound velocity and density data are used to calculate the isentropic compressibilities (k,) and deviations in isentropic compressibilities (AkJ. The values of V' are negative in all the systems except in the system, acetophenone + n-heptanol wherein the V L values are positive.Deviations in isentropic compressibilities are negative in all the systems over the entire range of composition. The data are used to explain the possible intermolecular interactions between unlike molecules. K E Y WORDS: Sound velocity. compressibility.