Assertion Chelates are relatively more stable than non-cheltated complexes
Reason Complexes containing ligands which can be easily replaced by other ligands are called labile complexes .

Options

A. If both `(A)` and ` (R )` are correct and `(R )` is the correct explanation of `(A ) ` .
B. If both `(A)` and ` (R )` are correct and `(R )` is the correct explanation of `(A ) ` .
C. If`(A)` is correct, but `( R )` is incorrect .
D. Both `(A)` and `(R ) ` are incorrect .

Answer

To solve the question regarding the assertion and reason provided, we need to analyze both statements carefully.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Chelates are relatively more stable than non-chelated complexes."
- **Explanation**: Chelates are complexes formed when a ligand binds to a central metal atom at multiple points, creating a ring structure. This ring formation increases the stability of the complex due to the chelate effect, which is a result of the entropy gain when the ligand forms a stable ring with the metal ion.

2. **Understanding the Reason**:
- The reason states that "Complexes containing ligands which can be easily replaced by other ligands are called labile complexes."
- **Explanation**: Labile complexes are those that undergo rapid ligand substitution. This means that the ligands in these complexes can be replaced easily, which often leads to lower stability compared to complexes with more stable ligands (like chelates).

3. **Analyzing the Relationship**:
- Both the assertion and the reason are true statements.
- However, the reason does not directly explain why chelates are more stable than non-chelated complexes. The assertion is about the stability of chelates, while the reason discusses the nature of labile complexes without linking it back to the stability of chelates.

4. **Conclusion**:
- Since both statements are true, but the reason does not serve as a correct explanation for the assertion, we conclude that:
- **Assertion (A)**: True
- **Reason (R)**: True
- **Relationship**: R is not the correct explanation of A.

5. **Final Answer**:
- The correct option is that both A and R are true, but R is not the correct explanation of A.