Question

higher order (>3) reactions are rare due to

Answer 1

According to the collision theory, the reactions occurs due to the collision of the reactant molecules.

In first and second order reactions the probability of collision is quite high as compared to the third and higher order reactions (It is quite unlikely that three or more than three molecules will collide at the same time).

Due to this very low probability of colliding of molecules, the higher order reactions (>3) are quite rare.

I hope this helps…