Which of the following pairs of species are not isostructural?

Which of the following pairs of species are not isostructural?
  1. $\mathrm{XeF}_{4}, \mathrm{PF}_{4}^{+}$
  2. $\mathrm{CH}_{4}$ and $\mathrm{NH}_{4}^{+}$
  3. $\mathrm{XeF}_{2}, \mathrm{I}_{3}^{-}$
  4. $\mathrm{XeF}_{5}^{+}, \mathrm{IF}_{5}$

Solution

$\mathrm{XeF}_{4}$ has 6 pairs of electrons around Xe while $\mathrm{PF}_{4}^{+}$has 4 pairs of electrons around $\mathrm{P} .$

Asked in: JEE-TOPICTESTS-CHEMISTRY

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