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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]?

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Nitrogen due to lack of d-orbitals with- it, is not able to expand its covalency beyond 4 whereas P can. Hence .R_3 N=0. cannot exist whereas .R_3 P=0. can.
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