Assertion : `N(CH_(2)CH_(2)NH_(2))_(3)` and EDTA are examples of polydentate ligands .
Reason : Ligands which can ligate through two different atoms is called polydentate ligand .

Options

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

Explanation

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

### Step 1: Understanding the Assertion
The assertion states that `N(CH₂CH₂NH₂)₃` and EDTA are examples of polydentate ligands.

- **Polydentate Ligands**: These are ligands that can attach to a central metal atom through multiple donor atoms.
- **N(CH₂CH₂NH₂)₃**: This ligand has three amine (NH₂) groups, which can donate lone pairs of electrons to a metal center, making it a polydentate ligand.
- **EDTA**: Ethylenediaminetetraacetic acid (EDTA) has multiple donor atoms (two nitrogen and four oxygen atoms) that can coordinate with a metal ion, thus it is also a polydentate ligand.

### Conclusion for Step 1
Both `N(CH₂CH₂NH₂)₃` and EDTA are indeed polydentate ligands. Therefore, the assertion is **correct**.

### Step 2: Understanding the Reason
The reason states that ligands which can ligate through two different atoms are called polydentate ligands.

- **Ambidentate Ligands**: Ligands that can coordinate to a metal through two different atoms (but not necessarily at the same time) are known as ambidentate ligands.
- This definition does not accurately describe polydentate ligands, which are defined by having multiple donor atoms that can bind simultaneously.

### Conclusion for Step 2
The reason provided is **incorrect** because it misdefines polydentate ligands.

### Final Conclusion
- The assertion is correct: `N(CH₂CH₂NH₂)₃` and EDTA are polydentate ligands.
- The reason is incorrect: the definition given is for ambidentate ligands, not polydentate ligands.

### Answer
Thus, the final answer is that the assertion is correct, and the reason is incorrect.