In which species,X-O bond order is 1.5 and co | vedclass

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(A) $1$. In $IO_2F_2^-$,the central atom $I$ has $7$ valence electrons. Including the negative charge and bonding with $2$ $O$ and $2$ $F$ atoms,it fo

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$IO_2F_2^-$

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(A) $1$. In $IO_2F_2^-$,the central atom $I$ has $7$ valence electrons. Including the negative charge and bonding with $2$ $O$ and $2$ $F$ atoms,it forms a structure with $1$ lone pair. The $I-O$ bond order is $1.5$ due to resonance,and it involves $p\pi - d\pi$ back-bonding between $O$ and $I$.$2$. In $HCOO^-$,the $C-O$ bond order is $1.5$,but it involves $p\pi - p\pi$ bonding,not $p\pi - d\pi$ bonding.$3$. In $SO_3^{2-}$,the $S-O$ bond order is $1.33$ and it involves $p\pi - d\pi$ bonding.$4$. In $XeO_2F_2$,the $Xe-O$ bond order is $2.0$ and it involves $p\pi - d\pi$ bonding.Therefore,the correct species is $IO_2F_2^-$.

In which species,$X-O$ bond order is $1.5$ and contains $p\pi - d\pi$ bond$(s)$?

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