Statement I : – C – Cl bond is stronger than Cl – Cl bondStatement II : C – H bond is stronger than C – Cl bond

Bond enthalpy of C–H>C–C>C–Cl>Cl–Cl ; ;Bond is very weak because of the repulsions between lone pairs of adjacent chlorine atoms.Size of H-atom <  size of C-atom(both these atoms do not possess a lone pair.); Bond enthalpy of H-H > C-H >C-CIn general Bond enthalpy ∝1size of atoms involved in bonding