Which is not true about metal carbonyls?

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Question

(D) $(D)$. $CO$ is called a $\pi$-acid ligand.In metal carbonyl complexes,there is a donation of an electron pair from the carbon atom to the empty or

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Here $p \pi - p \pi$ back bonding takes place.

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(D) $(D)$. $CO$ is called a $\pi$-acid ligand.In metal carbonyl complexes,there is a donation of an electron pair from the carbon atom to the empty orbital of the metal.Simultaneously,a back $\pi$-bonding is formed by the sideways overlap of a filled $d$-orbital on the metal with the empty antibonding $\pi^*_{2py}$ orbital of $CO$.This is known as $d \pi - p \pi$ back bonding,not $p \pi - p \pi$ back bonding.

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