question_answer 99)

  Assertion (A) All collision of reactant molecules lead to product formation. Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy Lead to compound formation.

Answer:

                  (e) Assertion is incorrect, but reason is correct. Correct assertion is "only effective collision lead to formation of product." Reason defines correct meaning of effective collision, and criterion of collision theory for completion of reaction. Only those collisions in which molecules have correct orientation and sufficient energy lead to formation of product.