The ultrasonic velocity, density and viscosity have been measured for the ternary liquid mixtures of cyclohexanone with 2-propanol and 2-methyl-2-propanol in carbontetrachloride at 303 K. The acoustical parameters such as adiabatic compressibility, free length, molar volume and internal pressure have been obtained from the experimental data for the liquid mixtures with a view to investigate the exact nature of the molecular interaction. The excess values of the above said parameters have also been calculated and found to be useful in estimating the strength of the interaction in the mixtures.