This document is from Mats University and provides an overview of the topic "Reaction Mechanism of Transition Metal Complexes Part II" presented by Jageshwar Sahu for his M.Sc course guided by Dr. Radha Krishnan. The presentation covers substitution reactions in square planar complexes, mechanisms of substitution reactions, trans effect theories and applications, redox reactions, electron transfer mechanisms including outer sphere and inner sphere types, and the Marcus-Huss theory.