MCQ
Which is not true about metal carbonyls?
- AHere $CO$ acts as a Lewis base as well as Lewis acid
- BHere metal acts as Lewis base as well as Lewis acid
- CHere $d \pi - p \pi$ back bonding takes place
- ✓Here $p \pi - p \pi$ back bonding takes place
✓
Answer
Correct option: D.
Here $p \pi - p \pi$ back bonding takes place
d
$(d)\, CO$ is called $\pi$ -acid ligand. In metal carbonyl complexes, there is donation of an eletron pair from carbon to the empty orbital of metal and then simultaneouslf a back $\pi$ - bonding is formed by sideways overlap of a filled orbital on the metal with empty antibonding $\pi_{2py}$ orbital of $CO$.
$(d)\, CO$ is called $\pi$ -acid ligand. In metal carbonyl complexes, there is donation of an eletron pair from carbon to the empty orbital of metal and then simultaneouslf a back $\pi$ - bonding is formed by sideways overlap of a filled orbital on the metal with empty antibonding $\pi_{2py}$ orbital of $CO$.
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