Question

The number of molecules of the reactants taking part in a single step of the reaction is indicative of :

• A. Order of a reaction
• B. Molecularity of a reaction
• C. Fast step of the mechanism of a reaction
• D. Half-life of the reaction

Answer 1

Answer: (B)

Molecularity of a reaction

For a single-step reaction, the molecularity of reaction is given by the sum of number of reactants that are taking part in the reaction.

For example-

$A+B\to C+D$

It is a single step reaction and total $2$ molecules are taking part in the reaction, so the molecularity of reaction is $2$.

Hence, the correct answer is option $\text{B}$.