Assertion (A) : The bond dissociation energy increases from F 2 to Cl 2 and then decreases to I 2 Reason (R) : The low bond energy of fluorine is due to the repulsion between the lone pairs of electrons in two fluorine atoms. The correct option among the following is

Question

Assertion (A) : The bond dissociation energy increases from F 2 to Cl 2 and then decreases to I 2 Reason (R) : The low bond energy of fluorine is due to the repulsion between the lone pairs of electrons in two fluorine atoms. The correct option among the following is, (A) is true, (R) is true and (R) is the correct explanation for (A), (A) is true, (R) is true but (R) is not the correct explanation for (A), (A) is true but (R) is false, (A) is false but (R) is true

MARKS App · Accepted Answer

Bond dissociation energy of F 2 molecule is less than that of Cl 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 Fluorine however the lone pairs have less space to be in, adding stress on the bond making its easier to break.

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