Which of the following pairs of species are not isostructural?

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${XeF}_{4}, {PF}_{4}^{+}$

${CH}_{4} and {NH}_{4}^{+}$

${XeF}_{2}, I_{3}^{-}$

${XeF}_{5}^{+}, {IF}_{5}$

answer is A.

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Detailed Solution

${XeF}_{4}$ has 6 pairs of electrons around Xe while ${PF}_{4}^{+}$ has 4 pairs of electrons around P. Thus , the pairs of species are not isostructural ${XeF}_{4}, {PF}_{4}^{+}$ .

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