In which of the following is ppi - dpi bondin | vedclass

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(B) In $SO_3^{2-}$ (sulfite ion),the central sulfur atom has an oxidation state of $+4$. The electronic configuration of sulfur is $[Ne] 3s^2 3p^4$. I

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$SO_3^{2-}$

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(B) In $SO_3^{2-}$ (sulfite ion),the central sulfur atom has an oxidation state of $+4$. The electronic configuration of sulfur is $[Ne] 3s^2 3p^4$. In the formation of $SO_3^{2-}$,sulfur undergoes $sp^3$ hybridization. One of the $p$-orbitals of oxygen overlaps with the empty $d$-orbital of sulfur to form a $p\pi - d\pi$ bond. In $NO_3^-$,$BO_3^{3-}$,and $CO_3^{2-}$,the central atoms $(N, B, C)$ belong to the second period and do not have $d$-orbitals available for bonding,so they only exhibit $p\pi - p\pi$ bonding.

In which of the following is $p\pi - d\pi$ bonding observed?

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