Which of the following is not true for metal | vedclass

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Question

(C) In metal carbonyls,the metal-carbon bond possesses both $\sigma$ and $\pi$ character. The $\sigma$ bond is formed by the donation of lone pairs of

Vedclass · Accepted Answer

Metal carbonyls are single bonded species.

Vedclass · Answer

(C) In metal carbonyls,the metal-carbon bond possesses both $\sigma$ and $\pi$ character. The $\sigma$ bond is formed by the donation of lone pairs of electrons from the carbonyl carbon to the vacant orbital of the metal. The $\pi$ bond is formed by the back-donation of electrons from the filled metal $d$-orbitals into the vacant antibonding $\pi^*$ orbitals of the $CO$ ligand. This is known as $d\pi - p\pi$ back-bonding. Therefore,the statement that $d\pi - p\pi$ overlap is not observed is false,and the statement that metal carbonyls are single bonded species is also incorrect as they exhibit multiple bond character. However,in the context of standard chemistry problems,the statement that metal carbonyls are single bonded species is the most fundamentally incorrect description of their bonding nature.

Which of the following is not true for metal carbonyls?

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