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Which of the following set of compounds/ions does not exist (under normal conditions)?

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${BrF}_{5}, {ClF}_{5}, {FCl}_{3}$

${ICl}_{3}, {ICl}_{4}, {IF}_{5}$

${XeF}_{4}, {XeF}_{5}^{+}, {XeF}_{2}$

${XeF}_{3}^{-}, {ClI}_{3}, {PBr}_{6}^{-}$

answer is B.

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Detailed Solution

${XeF}_{3}^{-}, {ClI}_{3}, {PBr}_{6}^{-}$ set of the compound does not exist (under normal conditions). ${XeF}_{3}^{-} \to$ $(l. p . at 90^{\circ}); {ClI}_{3}$ and ${PBr}_{6}^{-}$ (steric crowding).

Hence, option B is correct.

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