`NCl_3` is possible for nitrogen while `NCl_5` is not possible. For phosphorus atom `PCl_3` and `PCl_5` both are possible. The reason for this is.....

Options

A. P-atom possesses vacant d-orbitals, while N-atom does not possess.
B. The elctronegativity of P is less than that of N.
C. The tendency to form hydrogen bond for phosphorus is less than that of nitrogen
D. At normal temperature phosphorus is solid, while nitrogen possesses gaseous state.

Answer

A

Explanation

P-atom possesses vacant d-orbitals, while N-atom does not possess.