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  4. In which of the following p π - d π bonding is possible?

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Q. In which of the following $p \pi$ - $d \pi$ bonding is possible?

AIIMSAIIMS 2001Chemical Bonding and Molecular Structure

Solution:

Carbon, oxygen and nitrogen atoms do not have any $d$ orbital available. Therefore, in $CO _{3}{ }^{2-}, NO _{2}^{-}$ and $NO _{3}$, there is no possibility of $p \pi- d \pi$ type of bonding.

In $PO _{4}{ }^{3-}$ phosphorus atom has vacant $d$ orbital available which is used to form $p \pi- d \pi$ type of bonding with $p$ orbital of oxygen atom.