Consider Fig. 4.1 and mark the correct option.

Activation energy is the energy required to reach the activated complex and for a forward reaction from the graph given above the sum of energy E₁ and E₂ is required to carry the reaction forward.

According to Gibbs free energy, the energy of the product should be less than reactant in order to be stable but in the following graph, the energy of the product is more than that of reactants energy, hence it is less stable than reactant.

Thus option (i) is correct.