Question

Out of H-H and Cl-Cl bonds, which is expected to have higher bond enthalpy and why?

Answer 1

H-H is supposed to have higher bond enthalpy.
H-H has attained the noble gas configuration. So it is really hard to break the bond.
But in Cl-Cl, there are a lot of lone pairs of electrons. Due to the repulsion of these electrons, the bond enthalpy will be slightly lesser than in H-H.