Question

In metal carbonyl having general formula $M(CO{)}_x$ where, $M$ = metal, $x=4$ and the metal is bonded to

• A. carbon and oxygen
• B. $C\equiv 0$
• C. oxygen
• D. carbon

Answer 1

Answer: (D)

In metal carbonyl $M(CO{)}_4$, metal is bonded to the ligand $CO$ through carbon atoms. These compounds contain both $\sigma$ and $\pi$-bonded complexes.
$\sigma$-bond between metal and carbon atom is formed when a vacant hybrid bond of the metal atom overlaps with an orbital on $C$-atom of carbon mono oxide containing a low pair of electron formation of $\pi$-bond is caused when a filled orbital of the metal atom overlaps with a vacant antibonding $\pi$ - orbital of $C$-atom of $Co$.