In which of the following pairs

Question:

In which of the following pairs the two species are not isostructural ?

  1. $\mathrm{AlF}_{6}^{3-}$ and $\mathrm{SF}_{6}$

  2. $\mathrm{CO}_{3}^{2-}$ and $\mathrm{NO}_{3}^{-}$

  3. $\mathrm{PCl}_{4}^{+}$and $\mathrm{SiCl}_{4}$

  4. $\mathrm{PF}_{5}$ and $\mathrm{BrF}_{5}$


Correct Option: , 4

Solution:

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