JEE Advanced Chemistry question

The greater reactivity of F2 is due to

(A)Lower electron affinity of F
(B)Lower bond energy of F − F bondCorrect
(C)Higher electronegativity of F
(D)Gaseous state of F2

Answer: (B)

Solution

Because fluorine is such a small atom, its two lone pairs on each F atom of F2 experience strong mutual repulsion across the very short F–F bond, which anomalously weakens the F–F bond (bond dissociation energy ≈ 159 kJ/mol — lower than Cl–Cl). This low bond energy means F2 dissociates into

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Question ID VK-159349