Which one of the following is not a resonance structure of $CO_2$?

What is the $O-O$ bond length in an ozone $(O_3)$ molecule (in $pm$)?

Explain the structure of $CO_{2}$ molecule.

Resonance structures can be written for

Caliene,$C_7H_6$,is expected to be a fairly polar aromatic molecule. Which of the following resonance forms contributes to the greatest extent towards the real structure (resonance hybrid) of the molecule?

The correct order of sulphur-oxygen bond order in $SO_3$,$S_2O_3^{2-}$,and $SO_4^{2-}$ is: