Which is not true about metal carbonyls?

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Here CO acts as a Lewis base as well as Lewis acid

Here d $π$ -p $π$ back bonding takes place

Here metal acts as Lewis base as well as Lewis acid

Here p $π$ -p $π$ back bonding takes place

answer is D.

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Detailed Solution

CO is called $π$ -acid ligand. In metal carbonyl complexes, there is donation of an electron pair from carbon to the empty orbital of metal and then simultaneously a back $π$ -bonding is formed by sideways overlap of a filled orbital on the metal with empty antibonding $π$ $*$ _2py orbital of CO.

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