Identify the species having


Identify the species having one $\pi$-bond and maximum number of canonical forms from the following:

  1. $\mathrm{SO}_{3}$

  2. $\mathrm{O}_{2}$

  3. $\mathrm{SO}_{2}$

  4. $\mathrm{CO}_{3}^{2-}$

Correct Option: , 4


Among $\mathrm{SO}_{3}, \mathrm{O}_{2}, \mathrm{SO}_{2}$ and $\mathrm{CO}_{3}^{2-}$, only $\mathrm{O}_{2}$ and $\mathrm{CO}_{3}^{2-}$ has only one $\pi$-bond

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