Assertion(A) : In an isolated system, greater the disorder higher is the entropy
Reason(R) : When a system is in equilibrium, the entropy is maximum
 

If both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A)

If assertion (A) is true but reason(R) is false

If assertion (A) is false reason (R) is true

If both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A)