Abstract: Ultrasonic Velocity, density, viscosity have been measured experimentally for the solution of leaf extract of Cymbopogon Citratus in double distilled water with various concentrations at 298.15 K, 303.15 K, 308.15 K keeping constant frequency of 6 MHZ. As the acoustical parameters like adiabatic compressibility, intermolecular free length, relative association, relaxation time, specific acoustic impedance would prove to be more useful to predict and confirm the molecular interactions, these have been determined by measuring the Ultrasonic Velocity, density, viscosity of the prepared solution. A variation in these parameters will provide strong information regarding the molecular interactions taking place in the solution.