Question

Why does R₃P=O exist but R₃N=O does not (R = alkyl group)?

Answer 1

1. N cannot increase its covalency beyond 4 and produces dπ-pπ multiple bonds because it lacks d-orbitals.
2. As a result, it doesn't create R₃N=O compounds.
3. However, P can form dπ-pπ multiple bonds since it has d-orbitals.
4. It can create compounds of the type R₃P=O and expand its covalency up to 5.