(i) The activation energy of forwarding reaction is E1 + E2 and the product is less stable than reactant.

(ii) The activation energy of forwarding reaction is E1+E2and product is more stable than reactant.

(iii) The activation energy of both forward and backward reaction is E1+E2 and reactant is more stable than the product.

(iv) The activation energy of the backward reaction is E1 and the product is more stable than reactant.

Correct Answer: (i) The activation energy of forwarding reaction is E1 + E2 and the product is less stable than reactant.

Explanation: The given reaction is an endothermic reaction.