Question

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 equalto one
(c) the molecularity of the reaction is one and order is zero
(d) both molecularity and order of the reaction are one

Answer 1

The answers: (a), and (b).

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