Question

$PCl_5$ is possible but $NCl_5$ does not exist :

• A. in N, d-sub-shell is absent
• B. ionization energy of N is very high
• C. it does not like Cl
• D. None of these

Answer 1

Answer: (A)

in N, d-sub-shell is absent

Answer 2

$NCl_5$ in not possible because N does not contain d orbitals. Only nitrogen has a tendency to form $P \pi - P \pi$ multiple bonds. Other forms $d \pi - p \pi$ multiple bonds easily.