Which of the following set of species do not exist?

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${SH}_{6}, {SF}_{6}, {ClF}_{3}, {XeF}_{5}^{-}$

${AsH}_{5}, {BiI}_{5}, {XeF}_{3}^{-}$ (under normal conditions), ${FCl}_{3}$

${XeH}_{2}, {BiF}_{5}, {FCl}_{3}, {XeF}_{3}^{-}$ (under normal conditions)

${OF}_{6}, {XeF}_{6}, {SF}_{6}, {PCl}_{6}^{-}$

answer is C.

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Detailed Solution

${XeH}_{2}, {FCl}_{3}, {XeF}_{3}^{-}, {SH}_{6}, {AsH}_{5}, {BiI}_{5}, {OF}_{6}$ 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 ${XeH}_{2}'s$ 's nonexistence.

Hence correct option is C.

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