The number of \pi bonds and \sigma-bonds in case of lewis st... | Chemistry - Resonance and Bonding in Polyatomic Ions | SolveeIt

Question

The number of $\pi$ bonds and $\sigma$ -bonds in case of lewis structure of $SO_4^{2-}$ .

$4\sigma, 2\pi$

$4\sigma, 1\pi$

$4\sigma$ , zero $\pi$

$4\sigma, 4\pi$

Answer

Option (A) — $4\sigma, 2\pi$

Explanation

Solution

In the resonance hybrid of the sulfate ion, $\text{SO}_4^{2-}$ , there are four equivalent S–O bonds. Each bond is composed of one sigma ( $\sigma$ ) bond, and the delocalized pi ( $\pi$ ) bonding accounts for a total of 2 pi bonds spread over the structure.

Thus, the Lewis structure effectively contains 4 sigma bonds and 2 pi bonds.

Explanation (minimal):

4 S–O bonds → each bond has 1 $\sigma$ bond.
Delocalized $\pi$ bonds in the resonance structure contribute a total of 2 $\pi$ bonds.

Question: The number of $\pi$ bonds and $\sigma$-bonds in case of lewis structure of $SO_4^{2-}$....

Solution