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In which of these ions is pπ–dπ bonding absent?

1. SO₃²⁻
2. PO₄³⁻
3. NO₃⁻
4. XeO₄⁴⁻

Correct answer: NO₃⁻

Solution

p-pi to d-pi back-bonding requires vacant d-orbitals on the central atom. S, P and Xe all have accessible d-orbitals, but nitrogen in NO3- is a second-period element with no d-orbitals, so p-pi-d-pi bonding is absent there. Correct option: NO3-.

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