Ncert Exercises & Solutions

Select the correct option based on statements below:

Assertion (A):	All collisions of reactant molecules lead to product formation.
Reason (R):	Only those collisions in which molecules have the correct orientation and sufficient kinetic energy lead to the compound formation.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

HINT: Product formation depends on collision frequency and orientation.

Explanation:

The correct assertion is "only effective collision leads to the formation of the product." Reason defines the correct meaning of

effective collision, and criterion of collision theory for completion of the reaction. Only those collisions in which molecules

have correct orientation lead to the formation of the product. Hence, the assertion is incorrect, but the reason is correct.