In `Fe(CO)_(5)` the Fe-C bond possesses

Options

A. `pi`- character only
B. Ionic character
C. `sigma`- character only
D. Both `sigma` and `pi` characters

Answer

To solve the question regarding the nature of the Fe-C bond in `Fe(CO)_(5)`, we will analyze the bonding characteristics step by step.

### Step-by-Step Solution:

1. **Identify the Compound**:
- The compound in question is `Fe(CO)_(5)`, which is known as pentacarbonyl iron. It consists of one iron atom and five carbon monoxide (CO) ligands.

**Hint**: Recognize the structure and naming of the compound to understand its composition.

2. **Determine the Charge on Iron**:
- In `Fe(CO)_(5)`, there is no charge on the complex because CO is a neutral ligand. Therefore, the oxidation state of iron in this complex is zero.

**Hint**: Remember that CO is a neutral ligand, which helps in determining the oxidation state of the central metal.

3. **Analyze the Bonding**:
- The bonding in `Fe(CO)_(5)` involves the interaction between the iron atom and the CO ligands. CO acts as a σ (sigma) donor and a π (pi) acceptor.

**Hint**: Understand the roles of ligands in coordination complexes; CO can donate electron density and accept it as well.

4. **Formation of Sigma and Pi Bonds**:
- The carbon atom in CO donates a lone pair of electrons to the iron atom, forming a sigma bond (σ bond).
- Additionally, the increased electron density on the iron allows it to donate electrons back to the empty π* (pi anti-bonding) orbital of the CO, forming a pi bond (π bond).

**Hint**: Visualize the electron donation and acceptance process to grasp how both types of bonds are formed.

5. **Conclusion**:
- Since the Fe-C bond involves both a sigma bond and a pi bond, we conclude that the Fe-C bond possesses both sigma and pi character.

**Hint**: Recall that in coordination complexes, the presence of both types of bonds is common, especially with strong field ligands like CO.

### Final Answer:
The Fe-C bond in `Fe(CO)_(5)` possesses both Sigma and Pi character.