Question

$O-O$ bond length in ozone is ___ (shorter/longer) than $O-O$ bond in $O_2$.

Answer 1

The two equivalent resonance structures of ozone can be best depicted by the resonance hybrid structure, which indicates that the two $O-O$ bond length will be equal, with their length longer than $O=O$ double bond but shorter than $O-O$ single bond.

So, the correct answer is longer.