Describe the salient features of the collision theory of reaction rate of bimolecular reactions?

Molecular collision theory was proposed by Arrhenius
1. A reaction takes place only when reactant molecules collide with proper orientation.
2. All collisions do not lead to the formation of products.
3. The minimum energy that the reactant molecules should possess to give products is called “threshold energy”(ET)
4. The difference between the threshold energy and the average energy of molecules in the normal state is called a activation energy.
5. The molecules possessing the threshold energy are called activated molecules.
6. Collision occurring between activated molecules are called activated collisions (or) fruitful collisions. Activated collisions alone lead to the formation of the products of the reaction.
7. The fraction of the activated collisions amongst the total collisions is very much small.