Which of the following pairs of species are not isostructural?

A
${XeF}_{4}, {PF}_{4}^{+}$
B
${CH}_{4} and {NH}_{4}^{+}$
C
${XeF}_{2}, I_{3}^{-}$
D
${XeF}_{5}^{+}, {IF}_{5}$

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

Solution:

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