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

In case of nitrogen, `NCl_(3)`is possible but not `NCl_(5)` while in case of phosphorous `PCl_(3)` 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

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Nitrogen can form only one chloride with chlorine which is NCl_(3) whereas P can form PCl_(3) and PCl_(5) . This is

due to absence of d-orbitals in nitrogen

due to difference in size of N and P

due to higher reactivity of P towards Cl than N

due to presence of multiple bonding in nitrogen.