Question

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

• A. ${NO}_3^{-}$
• B. ${CO}_3^{-}$
• C. ${BO}_3^{-}$
• D. ${SO}_3^{-}$

Answer 1

Answer: (D)

The correct option is D ${SO}_3^{-}$
$p\pi -d\pi$ bonding includes d-orbitals,if you observe the options only S belongs to $3^{rd}$ period and has d-orbitals(though unoccupied in ground state).

Other options $C$ and $N$ belongs to $2^{nd}$ period while B belongs to $1^{st}$ period and doesn't have d-orbitals.