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The P-Block Elements

Question
CBSEENCH12006764

Why does R3P = O exist but R3N = 0 does not (R = alkyl group)?

Solution
R3P = 0 exists but R2 N = 0 does not exist because N- due to the absence of d-orbitals cannot form  - multiple bond thus N- cannot expand its covalency beyond the 4.
On other hand P due to having d- oribital forms  - mutiple bonds and hence can expand covalency beyond 4.
thus R3P = 0 exists but R2 N = 0 does not exist.