Molecular Interaction Studies are related with the Thermo-acoustical parameters and the present work is related to the analysis involved in the study of these excess values of thermoacoustical parameters and their Redlich-Kister Coefficients at different temperatures range from 303.15K to 318.15K with variation of 5K temperature interval for each study and all these are explained in liquid mixtures containing functional chemical combination namely (Benzene mixed with ethanol).The obtained excess values of acoustical parameters namely Gibb’s free energy (G*E ) , enthalpy (HE ) and internal pressure (πE ) have been computed from measured experimental data . The results have also been helpful to obtain Redlich-Kister coefficients from polynomial equation and also to obtain their deviations. Excess thermo-acoustical parameters are discussed along with Redlich-Kister coefficients generally for the study of interactions among the molecules of liquid species.