Which of the following factor is responsible for the $π$ character of the metal-carbon bond $(M - C)$ in carbonyl complexes?

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Overlap and donation from the lone pair of C into a vacant (hybrid) metal orbital to form a $M \leftarrow C$ bond,

Overlap and the donation from a filled $d_{xz}$ or $d_{yz}$ orbital on M into a vacant antibonding $π_{p}^{*}$ orbital on $CO$ to form a $M \to C$ bond.

Overlap and donation from the lone pair on vacant (hybrid) metal orbital into C to form a $M \to C$ bond.

Overlap and the donation from a filled vacant antibonding np * orbital on C into $d_{xz}$ or $d_{yz}$ orbital on M to form a $M \leftarrow C$ bond.

answer is B.

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Detailed Solution

Overlap and the donation from a filled $d_{xz}$ or $d_{yz}$ orbital on M into a vacant antibonding $π_{p}^{*}$ orbital on $CO$ to form a $M \to C$ bond. This reason is responsible for the pi character in the given bond.