Question

Collision theory is applicable to:
A. First order reactions
B. Zero order reactions
C. Bimolecular reactions
D. Intramolecular reactions

Answer 1

Think about the definition of the collision theory and consider what the word collision itself signifies and relate the same to any given reaction. Recall what terms like order and molecularity mean.

Complete step by step solution:
-To obtain the answer to this question, we will first look at the definition of collision theory and what are the circumstances in which the collision theory is applicable. Then we will determine which of the given options is correct.
-Collision theory states that when two or more particles that are travelling in random motion collide with each other they have to have a certain level of kinetic energy and the proper orientation for the reaction to take place. A successful collision is when a reaction does take place.
-Here, we can see that the collision theory requires the presence and participation of two or more that two particles. In the options that are given to us, the first two options A and B address the order of the reaction that is taking place. The order of any reaction relates to the concentration of the reactants on which the rate depends. The collision theory only talks about the number of molecules and whether the reaction takes place or not; it has nothing to do with concentrations and rates.
-The third option C addresses a bimolecular reaction. This indicates that there are two molecules involved in the reaction. Thus, the collision theory will be applicable in this case.
The fourth option D addresses an intramolecular reaction. This indicates that the reaction that takes place is within the molecule and no form of collision has to take place for the reaction to be completed. Thus, collision theory is not applicable for this option.

Hence, from the inferences above, we can say that the correct answer to this question is ‘C. Bimolecular reactions’

Note: Note that the collision theory does depend somewhat on the concentration of one of the molecules. If the concentration of one of the reactants is too less then the possibility of the other molecule colliding with it in just the right way decreases drastically.