Measurement of densities, p, viscosities, eta, and ultrasonic speeds, u, have been carried out for binary mixtures of phenylacetonitrile (PAN) with methylethylketone (MEK), methylpropylketone (MPK), methylisobutylketone (MIBK), and diethylketone (DEK) and their pure liquids at T = 308.15 K over the entire composition range. From these experimental data, excess molar volumes, V(E), deviations in viscosity, Delta eta, and isentropic compressibility, Delta kappa(s), of aliphatic ketones with phenylacetonitrile have been calculated. The variation of these properties with composition of the mixture suggests dipole-dipole interactions and charge transfer complex formation between associated phenylacetonitrile molecules and dipolar ketones. The magnitude of the property is found to depend on the chain length of the ketone molecule. These results have been fitted to the Redlich-Kister polynomial using multiparametric nonlinear regression analysis to estimate the binary coefficients and standard errors. The experimental data are used to test the applicability of empirical relations of Grunberg and Nissan, Tamura and Kurata and Hind, and McLaughlin and Ubbelohde for the system studied.