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Group 17 ElementsP Block elements G15-18

Arrange in increasing bond dissociation enthalpy: $F_{2}, Cl_{2}, Br_{2}, I_{2}$ .

Expert Answer

$I_{2} < F_{2} < Br_{2} < Cl_{2}$ . $F_{2}$ is exceptionally weak due to lone pair-lone pair repulsion in the small molecule.

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