In case of nitrogen,$NCl_3$ is possible but not $NCl_5$,while in case of phosphorus,$PCl_3$ as well as $PCl_5$ are possible. This is due to:

  • A
    Availability of vacant $d$-orbital in $P$ but not in $N$
  • B
    Lower electronegativity of $P$ than $N$
  • C
    Lower tendency of $H$-bond formation in $P$ than $N$
  • D
    Occurrence of $P$ in solid while $N$ in gaseous state at room temperature

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