The number of $d π - p π$ bonds in $C l {O_{3}}^{-}$ & $C l {O_{4}}^{-}$ ions are respectively

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1,2

2,4

2,3

3,4

answer is A.

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Detailed Solution

In $C l {O_{4}}^{-}$ , the chlorine atom has 7 valence electrons, and it forms bonds with four oxygen atoms. The chlorine atom forms one sigma and one pi bond (double bond) with three oxygen atoms and a single bond with the left one oxygen. The 3p and 3d orbitals of Cl remain unhybridized. It forms 3 dπ - pπ bonds.

In $C l {O_{3}}^{-}$ , the chlorine atom has 7 valence electrons, and it forms bonds with three oxygen atoms. The chlorine atom forms one sigma and one pi bond (double bond) with two oxygen atoms and a single bond with the left one oxygen. The 3p and 3d orbitals of Cl remain unhybridized. It forms 2 dπ - pπ bonds.

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