Chemically reacting mixing in coaxial miscible liquid jets under variable viscosities and reaction rates

•Multiscalar mixing in a chemically reactive miscible two-fluids system.•A parametric study by varying the viscosity and reaction rate constant ratios.•Inverse correlation between undesirable product and the desirable product.•Reaction fronts for different reaction rate constant and viscosity ratios.•Optimum reaction route with higher conversion efficiency of the desirable product.