Speeds of sound u, isentropic compressibilities kappa(S), viscosities eta, excess isentropic compressibilities kappa(S)(E), excess molar volumes V-E, viscosity deviations Deltaeta, and excess Gibbs energies of activation DeltaG(*E) of viscous flow have been investigated for six binary mixtures of diethyl malonate, diethyl bromomalonate, and ethyl chloroacetate with tetra- and trichloromethane at 303.15 K. The values of kappa(S)(E), V-E, Deltaeta and DeltaG*(E) are highly dependent on the type of components involved and the composition curves are unsymmetrical. The results obtained for viscosity of binary mixtures were used to test the semi-empirical relations of Grunberg-Nissan, Tamura-Kurata, Hind-McLaughlin-Ubbelohde, Katti-Chaudhri, McAllister, Heric-Brewer and Auslaender. The experimental speeds of sound have been analyzed in terms of collision factor theory and free length theory of solutions. (C) 2004 Elsevier B.V. All rights reserved.