The study of propagation of ultrasonic waves in liquids and liquid mixtures in very much useful for examining the nature of intermolecular interactions in chemical systems. Ultrasonic velocity is an important physical parameter which mainly depends on the structure of molecules. In the present investigation, ultrasonic velocities have been measured in binary mixtures of (i) Methanol - Chlorobenzene, (ii) Ethanol - Chlorobenzene and (iii) 1-Propanol - Chlorobenzene to understand the molecular interactions. Various models have been employed to calculate the acoustical parameters in order to substantiate these interactions. The various acoustic parameters such as adiabatic compressibility, free length, acoustic impedance, relaxation time, free volume, available volume and internal pressure were also measured to substantiate these interactions. Many interesting features were observed and they are carefully discussed.