Correct order of bond dissociation energy is (AIIMS 2019)

In general, bond enthalpy or bond dissociation energy of halogen molecules (X2) decreases the group from Cl2 to I2. Cl2 > Br2 > F2 > I2 The decreases in bond enthalpy from Cl2 to I2 are due to increases in atomic size that increase the distance between two. Hence, it becomes easier to break them apart. The exceptionally low bond dissociation energy of fluorine molecule is due to very small size of fluorine atom. This brings the non-bonding electrons on fluorine neater to each other resulting in much greater lone pair-lone pair repulsion which weakens the covalent bond and lowers its dissociat