Effects of chemical reaction on third-grade MHD fluid flow under the influence of heat and mass transfer with variable reactive index

In this work, third-grade magnetohydrodynamic fluid with variable thermal conductivity and chemical reaction over an exponentially stretching surface is examined. Effects of heat and mass transfer with heat source and sink are also analyzed. The analytical solutions are obtained by means of the homotopy analysis method (HAM). Convergence analysis of established solutions is also proposed. The physical interpretation of emerging parameters for velocity, temperature, and concentration profiles are presented by graphical and tabular illustrations. It is found that a rise in the magnetic parameter leads to a reduction in the thickness of boundary layer, whereas the reverse scenario is noticed for the case of heat sink and source.