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Why does R3P=0 exist but R3N=0 does not ...

Why does `R_3P=0` exist but `R_3N=0` does not `(R=` alkyl group)?

Text Solution

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`R_3P=O` exists as P due to presence of d-orbitals form
`dpi-ppi` bond with O-atom and hence expands its covalency to five. On the other hand `R_3N=0` does not exist, as N due to absence of d-orbitals in its valence shell cannot expand its covalency beyond four.
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