Ethylenediaminetraac etate ion froms an octo hedral complex with be metal ion
Reason It has six donor atoms which coordinate simultaneously to the metal ion .

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 formation of an octahedral complex by the ethylenediaminetetraacetate ion (EDTA) with a metal ion, we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Understanding EDTA Structure**:
- Ethylenediaminetetraacetate (EDTA) is a chelating agent that has a specific structure. It consists of two nitrogen atoms and four carboxylate groups (–COO⁻).
- The overall structure can be represented as:
```
H2N-CH2-CH2-NH2
| | |
COO⁻ COO⁻ COO⁻
```

2. **Identifying Donor Atoms**:
- In the EDTA molecule, the two nitrogen atoms each have a lone pair of electrons that can be donated to the metal ion.
- Additionally, each of the four carboxylate groups contributes one oxygen atom that can also coordinate to the metal ion.

3. **Counting the Total Donor Atoms**:
- The total number of donor atoms in EDTA is calculated as follows:
- 2 nitrogen atoms (each donating one pair of electrons)
- 4 oxygen atoms from the carboxylate groups (each donating one pair of electrons)
- Therefore, the total is:
- 2 (from N) + 4 (from O) = 6 donor atoms.

4. **Formation of the Octahedral Complex**:
- An octahedral complex requires six donor atoms to surround the central metal ion.
- Since EDTA has six donor atoms, it can effectively surround and coordinate with a metal ion, forming a stable octahedral complex.

5. **Conclusion**:
- The assertion states that EDTA forms an octahedral complex with a metal ion, and the reason explains that it has six donor atoms that can coordinate simultaneously.
- Both the assertion and reason are correct, and the reason provided is a valid explanation for the assertion.

### Final Answer:
Both the assertion and reason are correct, and the reason is the correct explanation of the assertion.