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What is the order of bond enthalpies of halogens? Why is it not opposite to that of bond lengths? |
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Answer» Solution :Bond lengths ofhalogens are in the ORDER : `F_(2)ltCl_(2)ltBr_(2)ltI_(2)`. Bond energies are expected in the order : `F_(2)ltCl_(2)ltBr_(2)ltCl_(2)`. But the experimental bond enthalpies are : `Cl_(2)gtBr_(2)gtF_(2)gtI_(2)`. Bond enthalpy of `F_(2)` is very less , because lone pair lone pair repulsions are APPRECIABLE in `F_(2)` as the bond LENGTH is small in `F_(2)`. It was also thought , though not APPROPRIATE , that F-F bond is weak as multiple bond is not possible with no d-orbitals in the valence shell of fluorine . |
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