Densities and ultrasonic speeds have been measured over the whole composition range for binary liquid mixtures of geranyl acetate with Amyl alcohol using a single crystal 2MHz ultrasonic interferometer at T = (288.15, 293.15, 298.15, 303.15, and 308.15) K and atmospheric pressure to evaluate these binaries’ behaviour. These data have calculated excess molar volume, deviation in adiabatic compressibility, excess free volume, excess intermolecular free length, excess gibs energy and excess enthalpy. These excess properties have been fitted with the Redlich– Kister type polynomial equation to get their coefficients and standard deviations, which provide a base for discussing the forces operating in solutions, FT-IR and the antibacterial activity of liquid combinations and individual chemicals were studied.