1)

 Higher order ( >3) reactions are rare due to


A) low probability of simultaneous collision of all the reacting species

B) increase in entropy and activation energy as more molecules are involved.

C) shifting of equilibrium towards reactants due to elastic collisions

D) loss of active species on collision

Answer:

Option A

Explanation:

 The main conditions for the occurrence of a reaction is proper orientation and effective collision of the reactants.

  Since the chances of simultaneous collision with proper orientation between more than 3 species is very rare, so reaction with order greater than 3 is rare.