Which of the following has the $p \pi-d \pi$ bonding?
Which of the following has the $p \pi-d \pi$ bonding?
$\mathrm{NO}_3^{-}$
$\mathrm{SO}_3^{2-}$
$\mathrm{BO}_3^{3-}$
$\mathrm{CO}_3^{2-}$
Solution
$\mathrm{SO}_3^{2-}$ has $\mathrm{p} \pi-\mathrm{d} \pi$ bonding.
$\pi$ backbonding, is a concept in which electrons move from an atomic orbital on one atom to an appropriate symmetry antibonding orbital on $a \pi$-acceptor ligand.
$\Rightarrow N, B$ and $C$ do not have $d$-subshell in valence shell.
$\Rightarrow N, B$ and $C$ do not have $d$-subshell in valence shell.