Question

PCl₃ and PCl₅ both exist; NCl₃ exists but NCl₅ does not exist.It is due to

(a) Iower electronegativity of P than N

(b) lower tendency of N to form covalent bond

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

(d) statement is itself incorrect

Answer 1

Correct option (c) availability of vacant d-orbital in P but not in N

Explanation:

Phosphorus (3rd-period element) can raise covalency  facilitating vacant d-orbitals

P(ground) [Ne] 3s² 3p³ 3d⁰

P(excited) [Ne] 3s¹ 3p³ 3d¹

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