Which of the following Group `15` elements do not show allotropy?

Options

A. N
B. As
C. Sb
D. Bi

Answer

D

Explanation

All the elements of group 15 except Bi show allotropy as nitrogen exists in two solid forms namely `alpha`-nitrogen and `beta`-nitrogen. Phosphorus exists in a number of allotropic forms. As exists as grey, yellow and black arsenic and Sb exists as metallic, `alpha` and `beta`-antimony.