In case of nitrogen, NCl3 is possible but not NClwhile in case of phosphorus, PCl3 as well as PClare possible. It is due to
(a) availability of vacant d orbitals in P but not in N
(b) lower electronegativity of P than N
(c) lower tendency of Hbond formation in P than N
(d) occurrence of P in solid while N in gaseous state at room temperature.

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1 Answers

(a) : 7N = 1s2 2s2 3p3
15P = 1s2 2s2 2p6 3s2 3p3
In phosphorus the 3dorbitals are available.

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