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Assertion : $\mathrm{O}_2$ has higher bond length than $\mathrm{O}_3$. Reason: $\mathrm{O}_3$ is paramagnetic.
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If both assertion and reason are false.
The resonance forms do not show any unshared electrons. Hence, $\mathrm{O}_3$, molecule does not show any paramagnetic properties.
The bond length decreases as bond order increases. Hence, bond length of $\mathrm{O}_3$ is higher than $\mathrm{O}_2$.
The bond length decreases as bond order increases. Hence, bond length of $\mathrm{O}_3$ is higher than $\mathrm{O}_2$.
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