Our objective here is to introduce the new chemical reaction model in MHD stagnation point flow. Mathematical modeling is based for the rheological relations of Casson liquid. Flow induced is due to sheet moving with nonlinear velocity. The velocity of external flow is also nonlinear. Effects of magneto-hydrodynamics (MHD), viscous dissipation and joule heating are also accounted. Nonlinear differential systems via implementation of appropriate transformations are computed through built in shooting method. Graphical and tabular behaviors of various pertinent parameters on velocity, temperature, concentration, skin friction and Nusselt and Sherwood numbers are analyzed. Our computed results interpret that velocity distribution decays for higher estimation of magnetic parameter while temperature distribution shows increasing behavior for larger homogeneous heat parameter. (C) 2017 Elsevier Ltd. All rights reserved.