Rank from largest to smallest equilibrium constant. To rank items as equivalent, overlap them KBr2, KCl2, KI2

KCl, >  KBr, > KI

Explanation:

KBr,   KCl,   KI

The equilibrium constant for the reaction between Alkene and Halogen to give Alkyl halide as a product

Keq =

hence the order of equilibrium from the Largest to the smallest equilibrium

= KCl, >  KBr, > KI

You should know that chemical reactions are things that you can not change back.
Physical reactions like ripping paper is still physical, the "paper" has not really changed

1) baking soda and vinegar mixed together.
2) An oven cooking a pie.
3) Burning a sheet of paper
4) rust, old peeling of some kind.