Question

Which one of the following is wrong about molecularity of a reaction?

• A. It may be whole number or fractional
• B. It is the number of molecules of the reactants taking part in a single step chemical reaction
• C. It is always equal to the order of elementary reaction
• D. It is always a whole number

Answer 1

The correct option is A It may be whole number or fractional

The molecularity of a reaction is defined as the number of molecules or ions that participate in the rate determining step. A mechanism in which two reacting species combine in the transition state of the rate-determining step.

Molecularity of a reaction can never be fractional. It is always a whole number.