Question

A reaction involving two different reactants can never be
(a) unimolecular reaction
(b) first order reaction
(c) second order reaction
(d) bimolecular reaction

Answer 1

Correct option(a) unimolecular reaction

Explanation:

There are two different reactants (say A and B).

It is first order reaction.

Molecularity is independent of rate but is the sum of the reacting substances. Thus, it cannot be a unimolecular reaction.