Molecular Interactions in the Binary Mixtures of Benzyl Benzoate in Benzene and Substituted Benzenes - an Ultrasonic Study

Ultrasonic velocities, densities and viscosities have been measured experimentally in the binary mixtures of benzene/aromatic alkanes and substituted benzenes at 30°C with benzyl benzoate as common component. Thermodynamic and other allied parameters like adiabatic compressibility, internal pressure, enthalpy, activation energy etc., have been computed and the variation of the excess parameters is discussed in the light of molecular interactions in the binary mixtures. In the mixtures of benzyl benzoate with aromatic alkanes, benzene, toluene and xylene, strong AB interactions besides dipole-induced dipole interactions are indicated while in chlorobenzene, bromobenzene (halogeno/halogeno substituted benzenes) and nitrobenzene systems, weak interactions besides dispersive forces are suggested. From theoretical evaluation of velocities using five theories - FLT, CFT, NOMOTO, VANDAEL & JUNJIE, CFT, JUNJIE and NOMOTO are observed to have an edge.