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Question: Answered & Verified by Expert
In which of the following $p \pi-d \pi$ bonding is possible?
ChemistryChemical Bonding and Molecular StructureAIIMSAIIMS 2001
Options:
  • A $\mathrm{CO}_3{ }^{2-}$
  • B $\mathrm{PO}_4{ }^{3-}$
  • C $\mathrm{NO}_3^{-}$
  • D $\mathrm{NO}_2^{-}$
Solution:
2297 Upvotes Verified Answer
The correct answer is: $\mathrm{PO}_4{ }^{3-}$
Carbon, oxygen and nitrogen atoms do not have any $d$-orbital available. Therefore, in $\mathrm{CO}_3^{2-}, \mathrm{NO}_2^{-}$ and $\mathrm{NO}_3^{-}$, there is no possibility of $p \pi-d \pi$ type of bonding.
In $\mathrm{PO}_4{ }^{3-}$ 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.

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