Question

Which of the following has $ p\pi -d\pi $ bonding?

• A. $ NO_{3}^{-} $
• B. $ SO_{3}^{2-} $
• C. $ BO_{3}^{3-} $
• D. $ CO_{3}^{2-} $

Answer 1

Answer: (B)

$S O_{3}^{2-}$ has three o-bonds and one $p \pi-d \pi$ bond. $S$ is $s p^{3}$ - hybridised and one of the $s p^{3}$ - hybrid orbitals is occupied by a lone pair of electrons.