Assertion :Bond dissociation energy of $F_{2}$ molecule is less than that of $C l_{2}$ molecule. Reason: Due to inter-electronic repulsion between F atom ,F---F bond length in $F_{2}$ molecule is higher than Cl--Cl bond length in $C l_{2}$ molecule

Read the above assertion and reason and choose the correct option regarding it.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Bond dissociation energy of $F_{2}$ molecule is less than that of $C l_{2}$ molecule because F has smaller radius and due to smaller size repulsion is high.
Both have 3 lone pairs but in the case of chlorine the lone pairs have more space to be in, leading to a lower stress on the bond. In flourine however the lone pairs have less space to be in, adding stress on the bond making its easier to break.

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