Strongest C-O bond is present in

Options

A. `Fe(CO)_(5)`
B. `Mn(CO)_(6)^(+)`
C. `Cr(CO)_(6)`
D. `V(CO)_(6)^(-)`

Answer

To determine which compound has the strongest C-O bond, we need to analyze the oxidation states of the metals in the given coordination compounds. The strength of the C-O bond in metal carbonyl complexes is influenced by the oxidation state of the metal.

### Step-by-Step Solution:

1. **Identify the Compounds**: We need to look at the compounds provided in the question. Let's denote them as Compound A, Compound B, Compound C, and Compound D.

2. **Determine the Oxidation States**:
- For each compound, determine the oxidation state of the metal.
- For example:
- In Compound A, if the metal is Manganese (Mn), its oxidation state is +1.
- In Compound B, if the metal is Chromium (Cr), its oxidation state is 0.
- In Compound C, if the metal is Vanadium (V), its oxidation state is -1.
- In Compound D, if the metal is Manganese again, its oxidation state is 0.

3. **Understand the Relationship Between Oxidation State and Bond Strength**:
- As the oxidation state of the metal increases, the ability of the metal to back-donate electron density to the π* orbitals of CO increases. This back-donation weakens the C-O bond.
- Conversely, a lower oxidation state means less back-donation and thus a stronger C-O bond.

4. **Analyze the Oxidation States**:
- From the oxidation states determined:
- Mn (+1) in Compound A
- Cr (0) in Compound B
- V (-1) in Compound C
- Mn (0) in Compound D
- The highest oxidation state is +1 for Manganese in Compound A.

5. **Conclusion**:
- Since the C-O bond strength is inversely related to the oxidation state of the metal, the compound with the highest oxidation state (Mn in +1 state) will have the strongest C-O bond.
- Therefore, the strongest C-O bond is present in the compound with Manganese in the +1 oxidation state.

### Final Answer:
The strongest C-O bond is present in the compound with Manganese in the +1 oxidation state.

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