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Assertion : Bond energy of $\mathrm{F}_2$ is lesser than $\mathrm{Cl}_2$. Reason : F-atom is smaller in size than $\mathrm{Cl}$.
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If both assertion and reason are true and reason is the correct explanation of assertion.
Bond energy of $\mathrm{F}_2$ is lesser than $\mathrm{Cl}_2$ because atomic size of $\mathrm{F}$ is smaller and three lone pairs on each $\mathrm{F}$ - atom cause relatively greater repulsive interactions.
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