‘A’ is a substance that converts into B, C and D by three first order parallel paths simultaneously according to the following stoichiometry.

The partial t_1/2 of A along path I and path II are 173.25 min and 346.5 min, respectively. The energies of activation of the reaction along path I, path II and path III are 40 kJ mol^–1, 60 kJ mol^–1 and 80 kJ mol^–1 respectively.