Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)?

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Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)?

ChemistryChemical Bonding and Molecular StructureNEETNEET 2012 (Screening)

Options:

A $\left[\mathrm{BCl}_3\right.$ and $\left.\mathrm{BrCl}_3\right]$
B $\left[\mathrm{NH}_3\right.$ and $\left.\mathrm{NO}_3^{-}\right]$
C $\left[\mathrm{NF}_3\right.$ and $\left.\mathrm{BF}_3\right]$
D $\left[\mathrm{BF}_4^{-}\right.$and $\left.\mathrm{NH}_4^{+}\right]$

Solution:

2486 Upvotes Verified Answer

The correct answer is: $\left[\mathrm{BF}_4^{-}\right.$and $\left.\mathrm{NH}_4^{+}\right]$

If number of bond pairs and lone pairs are same for the given pairs, they are isostructural.
(a)

(b)

(c)

(d)

Thus, $\mathrm{BF}_4^{-}$and $\mathrm{NH}_4^{+}$are isostructural.

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