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Among the following the pπ–dπ overlap could be present in

1. NO₂⁻
2. NO₃⁻
3. PO₄³⁻
4. CO₃²⁻

Correct answer: PO₄³⁻

Solution

The pπ–dπ overlap occurs when a p-orbital of one atom overlaps with a d-orbital of another atom. In PO₄³⁻, phosphorus (P) can utilize its vacant d-orbitals to form pπ–dπ bonds with oxygen atoms.

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