Assertion: Hydrazine is a neutral ligand.
Reason: It has two N as donor atoms and behaves as a chelating ligand.

Options

A. If assertion is true but the reason is false
B. If assertion is false but reason is true
C. If both assertion and reason are true and the reason is the correct explanation of assertion
D. If both assertion and reason are true but reason is not the correct explanation of assertion

Explanation

**Step-by-Step Solution:**

1. **Understanding the Assertion:**
- The assertion states that hydrazine is a neutral ligand.
- Hydrazine (N2H4) does not carry any positive or negative charge, which makes it a neutral ligand.

2. **Analyzing the Reason:**
- The reason provided states that hydrazine has two nitrogen atoms as donor atoms and behaves as a chelating ligand.
- It is true that hydrazine has two nitrogen atoms that can act as donor atoms.

3. **Evaluating Chelating Ability:**
- A chelating ligand is one that can form multiple bonds with a metal ion, typically resulting in the formation of a ring structure.
- For hydrazine to act as a chelating ligand, it would need to form a stable ring with the metal ion.

4. **Stability of the Chelate:**
- If hydrazine were to chelate a metal ion, it would form a three-membered ring (due to its two nitrogen donor atoms and the metal).
- Three-membered rings are generally unstable due to angle strain, making it unfavorable for hydrazine to act as a chelating ligand.

5. **Conclusion:**
- The assertion is correct: hydrazine is a neutral ligand.
- The reason is incorrect: hydrazine does not behave as a chelating ligand because the chelate formed would be unstable.

6. **Final Answer:**
- The correct answer is that the assertion is true, but the reason is false.

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