Question

Which of the following do have $p_{\pi }$ - $d_{\pi }$ bonding?

• A. $N{O}_3^{-}$
• B. $S{O}_3^{-2}$
• C. $B{O}_3^{-3}$
• D. $C{O}_3^{-2}$

Answer 1

The correct option is B $S{O}_3^{-2}$

$p\pi -d\pi$ 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.