Question

ICl is more reactive than I2.WHY?

Answer 1

inter halogen bonds are weaker(it is between two different halogens like ICI) because of its partly ionic character due to difference in electronegativities.
While when same halogens form X2(like I2) molecules and they form covalent bonds which are stronger than interhalogen compound and weak bond obviously is more reactive than the stronger bond and that's why ICI is more reactive than I2.

Answer 2

Hey !!

ICI is more reactive than I₂ because I ---- CI bond is weaker than I -- I bond. Consequently, ICI breaks easily to form halogen atoms which readily bring about the reactions.

Hope it helps you !!