question_answer 62)

  In any unimolecular reaction.......... (a) only one reacting species is involved in the rate determining step (b) the order and the molecularity of slowest step are equal to one (c) the molecularity of the reaction is one and order is zero (d) both molecularity and order of the reaction are one

Answer:

                  (a, b) Since, the reaction is an unimolecular reaction. Hence, in the slowest step i.e., in the rate determining step the only one reacting species is involved. Therefore, order of reaction and molecularity of reaction is equal to one.