Which of the following statements is correct ?

Options

A. An activated complex is formed before a reaction
B. An activation complex is formed after a reaction
C. An activated complex has longer life
D. An activated complex has infinite life

Answer

A

Explanation

The species temporarily formed by the reactant molecules as a result of the collision before they from the product is called the activated complex. The number of molecularity of an elementary reaction (a more precies definition of molecularity). Thus, a unimolecular process must be preceded by collision between the molecule that is to react and other molecules in the system in order to raise the energy of the reacting molecules to the level of the activatedd complex.