In this manuscript, densities, rho, speeds of sound, u, and viscosities, eta for binary mixtures of 1-butyl-3-methylimidazoliumbis(trifluoromethylsulfonyl)imide([C(4)mim][NTf2]) with molecular organic solvents (MOS) namely butyl acetate (BAC), butan-1-amine (BAM) and butanal (BAL) were measured at entire range of compositions. The measurements were collected at atmospheric pressure and temperature ranges from (298.15 to 323.15) K. The excess molar volumes, V-m(E), excess molar isentropic compressibilities, K-S,m(E), and logarithm of viscosity, ln eta(m) were derived from measured values of densities, rho, speeds of sound, u, and viscosity, eta, respectively. The V-m(E), K-S,m(E) and in eta(m) were correlated using Redlich-Kister polynomial equation. The non-ideal behaviour of these binary mixtures was discussed in light of temperature, nature of molecular organic solvent, structural effect and extent of molecular interactions exist in the binary mixtures. The V-m(E) and K-S,m(E), were negative and decrease with increasing temperature. The experimental V-m(E) were reviewed by Prigogine-Flory-Patterson (PFP) theory. (C) 2015 Elsevier Ltd. All rights reserved.