The Cl2 is more reactive than ClF is incorrect statement as reactivity order can be written as follows F2>ClF (interhalogen compounds) >Cl2. Interhalogen compounds are more reactive than pure halogen compounds as the bonds are polar and weaker than pure halogen compounds. ∴ statement (a) is incorrect. F2 is highly reactive among all interhalogens or pure halogen compounds due to strong interelectronic repulsion between F - atoms.