# Which of the following pairs of ions are isoelectronic and isostructural? Option 1) $ClO^{-}_{3}, CO^{2-}_{3}$ Option 2) $SO^{2-}_{3}, NO^{-}_{3}$ Option 3) $ClO^{-}_{3}, SO^{2-}_{3}$ Option 4) $CO^{2-}_{3}, SO^{2-}_{3}$

As we learnt in

Isosteres -

Molecules or polyatomic ions containing same number of atoms and the same total numbers of electron are called isosteres.Generally isosteres have identical lewis structure.

$Example\rightarrow CO,\:N_{2}\:and\:CN^{-}$

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Isolectronic and Isotructural units can also be called isosteres

No. of electrons in $ClO_{3}^{-} = 17\: +24\: +\: 1= 42$

No. of electrons in $SO_{3}^{2} = 16\: +\: 24+\: 2\: =\: 42$

$ClO_{3}^{-}$ and $SO_{3}^{2-}$, both are $sp^{3}$ hybridized and thus have similar structure.

Option 1)

$ClO^{-}_{3}, CO^{2-}_{3}$

This this is incorrect option

Option 2)

$SO^{2-}_{3}, NO^{-}_{3}$

This this is incorrect option

Option 3)

$ClO^{-}_{3}, SO^{2-}_{3}$

This this is correct option

Option 4)

$CO^{2-}_{3}, SO^{2-}_{3}$

This this is incorrect option

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