Measurement of densities (q), viscosities (g), and ultrasonic speeds (u) has been carried out for binary mixtures of N,N-diethylaniline (N,N-DEA) with acetone (AC), methylethylketone (MEK), methylpropylketone (MPK), diethylketone (DEK), and methylisobutylketone (MIBK), and their pure liquids at 303.15 K and 308.15 K over the entire composition range. These experimental values have been used to calculate the excess molar volume (V E ), deviation in ultrasonic speeds (Du), deviation in isentropic

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... compressibility (Dj s ), deviation in intermolecular free length (DL f ), deviation in acoustic impedance (DZ), excess Gibbs free energy of activation of viscous flow (G *E ) and deviation in viscosity (Dg). The variation of these properties with composition of the mixtures suggests dipole-dipole interactions and charge-transfer complex formation between N,N-diethylaniline and dipolar ketones. The magnitude of the property is found to depend on the chain length of the ketones' molecule. The viscosity data have been correlated using three equations: Grunberg and Nissan, Katti and Chaudhri and Hind et al. These results have been fitted