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NEET levelSingle correct optionDifficulty 1 of 3cc174

The 'synergic' bonding in a metal carbonyl $M - CO$ consists of:

A $σ$ donation from M to C and $π$ back-donation from CO into vacant metal orbitals
B $σ$ donation from C to M and $π$ back-donation from M into $π^{*}$ of CO
Conly $σ$ donation from the oxygen lone pair to the metal
Donly ionic attraction between $M X^{n +}$ and $CO$

Answer: B

Synergic means the two effects reinforce each other. The lone pair on carbon is donated to a vacant metal orbital (

σ

bond), and the filled metal

d

orbitals donate back into the empty

π^{*}

orbitals of

CO

(

π

back-bonding). Each interaction strengthens the other.

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