Identify the species having one $\pi$-bond and maximum number of canonical forms from the following :
$\mathrm{CO}_{3}^{2-}$
$\mathrm{O}_{2}$
$\mathrm{SO}_{2}$
$\mathrm{SO}_{3}$
Point out incorrect statement about resonance
Resonating structures have different
Polarization of electrons in acrolein may be written as
Which of the following conditions is not correct for resonating structures?
The number of possible resonance structures for $CO_3^{2 - }$is