In case of nitrogen, NCl(3) is possible ...

In case of nitrogen, `NCl_(3)` is possible but not `NCl_(5)` while in case of phosphorous, `PCl_(5)` are possible. It is due to

(1) availability of vacant d-orbital in P but not in N.

(2) lower electronegativily of P then N.

(3) lower tendency of H bond formation in P than N.

(4) occurrence of P In solid while N in gaseous state at room temperature.

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In case of nitrogen, NCl_(3) is possible but not NCl_(5) while in case of phosphorous, PCl_(5) as well as PCl_(5) are possible. It is due to

Availability of vacant d-orbital in P but not in N

Lower electronegativity of P than N

Lower tendency of H bond formation in P than N

Occurrence of P in solid while N in gaseous state at room temperature

Availability of vacant d-orbital in P but not in N

Lower electronegativity of P than N

Occurrence of P in solid while N in gaseous state at room temperature

Occurrence of P in solid while N in gaseous PREL T state at room temperature

due to absence of vacant 'd' orbital

due to steric repulsion

both (1) and (2)

none of these