The ultrasonic velocity (u), density (ρ), and viscosity (η) have been measured for the binary mixtures of Butanol +N,N Dimethyl acetamide m, Pentanol + N, N Dimethyl acetamide,and Hexanol + N, N Dimethyl acetamide at 300C. The experimental data have been used to calculate the acoustical parameters namely adiabatic compressibility (β), intermolecular free length (Li), acoustical impedance (Z) ultrasonic absorption ([α/f2]), the excess values of some of the above parameters have also been evaluated. The results obtained here are used to explain the molecular interaction between the components of the binary mixture. Thermodynamic properties are useful for understanding the variations in liquid structure and the molecular interaction of the liquid mixtures. Ultrasonic investigation finds extensive applications in probing in to the physico-chemical behavior and properties of the liquid and binary liquid mixture. Investigation results are used in design processes in the chemical and petrochemical industries. The measurement of ultrasonic velocity in liquids and liquid mixtures is used as an effective tool to prove the properties of liquid mixtures. Pure liquids and liquid mixtures consisting polar & non-polar components are considerable importance in analyzing intermolecular interaction between component molecules and molecular structure accurately. The ultrasonic investigations of these studies find several applications in the field of research in science, technology and industries. The excess values of acoustical parameters of binary liquid mixture are useful in understanding the solute-solvent interactions. Ultrasonic studies provide a wealth of information about the state of liquid.