The correct statements about metal carbonyls are A. The metal-carbon bonds in metal carbonyls possess both σ and π -character. B. Due to synergic…

The correct statements about metal carbonyls are A. The metal-carbon bonds in metal carbonyls possess both $\displaystyle \sigma$ and $\displaystyle \pi$ -character. B. Due to synergic bonding interactions between metal and CO ligand, the metal-carbon bond becomes weak. C. The metal-carbon $\displaystyle \sigma$ bond is formed by the donation of lone pair of electrons on the carbonyl carbon into a vacant orbital of metal. D. The metal-carbon $\displaystyle \pi$ bond is formed by the donation of electrons from filled d-orbital of metal into vacant $\displaystyle \pi^*$ orbital of CO. Choose the correct answer from the options given below: