Which of the following set of species do not exist?

${\mathrm{XeH}}_2,{\mathrm{FCl}}_3,{\mathrm{XeF}}_3^{-},{\mathrm{SH}}_6,{\mathrm{AsH}}_5,{\mathrm{BiI}}_5,{\mathrm{OF}}_6$ do not exist

A non-electronegative element would cause the electrical repulsion between the tiny sized atom and electron pairs to increase and prevent the existence of the pairs, a very electronegative element can balance the polarity of the complex. This is one of the primary causes of ${\mathrm{XeH}}_2\text{ 's }$'s nonexistence.

Hence correct option is C.