1.

Account for The electron affinity of fluorine is less than that of chlorine.

Answer»

Bond dissociatio enthalpy should decreases as the bond distance increases from I2 to I1 due to this corresponding increase in the size of the atom as we move from F to I. However, the F-F bond dissociation enthalpy is smaller than that of Cl-Cl and even smaller than that of Br-Br. This is due to the reason that the F atom is very small and hence the three lone pairs of electrons on each F atom repel the bond pair holding the F - atoms F2 molecule.

∴ I2 < F2 < Br2 < Cl2



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