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 assertion and reason question, we need to analyze both statements and determine their correctness and relationship.

### 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 metal ion at multiple points, creating a ring structure. This ring structure adds stability to the complex due to the chelate effect, which is a thermodynamic advantage.

2. **Evaluating the Assertion**:
- This statement is **true**. Chelated complexes are indeed more stable than non-chelated complexes because of the formation of stable ring structures.

3. **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 substitution of ligands. This means that the ligands in these complexes can be replaced quickly by other ligands.

4. **Evaluating the Reason**:
- This statement is also **true**. Labile complexes are characterized by their ability to undergo rapid ligand exchange.

5. **Analyzing the Relationship**:
- The assertion and reason are both true, but the reason does not provide a correct explanation for the assertion. The assertion is about the stability of chelates compared to non-chelates, while the reason discusses the nature of labile complexes without linking it to the stability of chelates.

6. **Conclusion**:
- Both the assertion and reason are true, but the reason is not the correct explanation for the assertion.

### Final Answer:
- Both the assertion and reason are true, but the reason is not the correct explanation of the assertion.