Which of the following does NOT exist?

A $PCl X_{5}$
B $SbCl X_{5}$
C $AsF X_{5}$
D $NCl X_{5}$

Answer: D

Nitrogen has no vacant d orbitals and cannot expand its octet to five bonds, so no pentahalide of nitrogen exists. P, As and Sb use d orbitals (sp3d) and form PCl5, AsF5 and SbCl5.

Practice p-Block Elements: Groups 15 and 16 More on Trends in groups 15 and 16

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