Question

Which of the following statement regarding bonding in metal carbonyls is correct?

Answer 1

Metal–carbon bond in metal carbonyls possesses​ both $\sigma$ and $\pi$ character.
Metal–carbon $\sigma$ bond is formed by the donation of lone pair of ​ electrons of carbonyl carbon into vacant d-orbital of metal.

Metal–carbon $\pi$ bond is formed by the donation of lone pair of electrons from filled d-orbital of metal to vacant ${\pi }^{\ast }$ orbital of carbonyl