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Density ρ, viscosity η, and refractive index nD were measured for the binary  mixtures of diethyl malonate with ketones (acetophenone, cyclopentanone,  cyclohexanone and 3-pentanone) at temperatures (303.15, 308.15 and 313.15) K  over the entire composition range. Excess volume VE, deviation in viscosity  Δη, excess Gibb’s free energy of activation for viscous flow ΔGE and  deviation in molar refraction ÄR were determined from the experimental data  and computed results were fitted to the Redlich-Kister polynomial equation.  The values of VE, Δη, ΔGE, and ΔR were plotted against the mole fraction of  diethyl malonate. The observed positive and negative values of excess  parameters for all the studied binary mixtures were explained on the basis of  intermolecular interactions present in these mixtures. Further different  empirical relations were used to correlate the binary mixture viscosities and  refractive indices

Volumetric, viscometric and optical study of molecular interactions in binary mixtures of diethyl malonate with ketones at 303.15, 308.15 and 313.15K