(i) only one reacting species is involved in the rate-determining step.

(ii) the order and the molecularity of the slowest step are equal to one.

(iii) the molecularity of the reaction is one and order is zero.

(iv) both molecularity and order of the reaction are one.

Correct Answers:

(i) only one reacting species is involved in the rate-determining step.

(ii) the order and the molecularity of the slowest step are equal to one.

(iii) the molecularity of the reaction is one and order is zero.

Explanation: In any unimolecular reaction, only one reacting species is involved in the rate-determining step, the order and the molecularity of the slowest step are equal to one and the molecularity of the reaction is one and order is zero.