A: Higher the charge density on the central ion, greater will be stability of the complex
R: Hard acid show a greater tendency for forming complexes with hard ligands such as F

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
C. ) If Assertion is true statement but Reason is false, then mark (3).
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To analyze the given statements regarding coordination compounds, we can break down the assertion (A) and reason (R) as follows:

### Step-by-Step Solution:

1. **Understanding Assertion (A)**:
- The assertion states: "Higher the charge density on the central ion, greater will be the stability of the complex."
- Charge density refers to the charge of the ion divided by its size. A higher charge density means that the central ion has a higher charge relative to its size, which typically leads to stronger interactions with ligands.

2. **Understanding Reason (R)**:
- The reason states: "Hard acids show a greater tendency for forming complexes with hard ligands such as F."
- Hard acids are those that are small and have a high charge, while hard ligands are those that are also small and have high electronegativity. The interaction between hard acids and hard ligands tends to be stronger due to their similar properties.

3. **Analyzing the Relationship**:
- The assertion is correct because a higher charge density does indeed lead to greater stability of the complex due to stronger electrostatic interactions with ligands.
- The reason is also correct since hard acids do have a tendency to form complexes with hard ligands. However, the reason does not directly explain the assertion. The stability of the complex is influenced by charge density, while the tendency to form complexes is influenced by the nature of the acids and ligands involved.

4. **Conclusion**:
- Both the assertion and reason are correct statements, but the reason does not provide a correct explanation for the assertion. Therefore, the conclusion is that while both statements are true, they are not directly related in the context of explaining the stability of the complex.

### Final Answer:
- Both A and R are correct, but R is not the correct explanation of A.