Question

In $Fe{\left(CO\right)}_5$, the $Fe-C$ bond possesses :

• A. $\pi$ character only
• B. $\sigma$ character only
• C. ionic character only
• D. both $\pi$ and $\sigma$ characters

Answer 1

The correct option is D both $\pi$ and $\sigma$ characters

The metal-carbon bond in metal carbonyls possesses both s and p character.

M-C $\sigma$ bond - ligand to metal bond

M-C $\pi$ bond - metal to ligand

Metal-ligand: The metal to ligand bonding creates a synergic effect which strengthens the bond between $CO$ and the metal.

Therefore, the correct option is D.