The ultrasonic velocities U, densities ρ of Binary Mixtures of O - Chlorophenol with 1- hexanol, 1- heptanol and 1- octanol from 303.15 to 318.15K. Excess molar volume (VE), deviation in adiabatic compressibility (Δβad) and excess intermolecular free length (LfE) have been calculated from the measured experimental data. The values of VE, Δβad and LfEhave been tted to Redlich – Kister polynomial equation to estimate binary coefcients and standard deviation between the experimental and computed values.