Assertion : $\mathrm{O}_2$ has higher bond length than $\mathrm{O}_3$. Reason: $\mathrm{O}_3$ is paramagnetic.

Assertion : $\mathrm{O}_2$ has higher bond length than $\mathrm{O}_3$. Reason: $\mathrm{O}_3$ is paramagnetic.
  1. both assertion and reason are true and reason is the correct explanation of assertion.
  2. both assertion and reason are true but reason is not the correct explanation of assertion.
  3. assertion is true but reason is false.
  4. both assertion and reason are false.

Solution

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 $\mathrm{O}_2$.

Asked in: NEET 2012 (Mains)

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