The correct sequence for product formation according to the Collision theory of chemical reaction is
(A) Proper orientation
(B) Molecules collide with threshold energy
(C) Intermediate formation
(D) Formation of products
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (B), (A), (C), (D)
By the collision theory, a reaction takes place only through effective collisions: the molecules must collide with at least the threshold energy and with the proper orientation. In such a collision the old bonds start breaking and new ones start forming, through a short-lived intermediate (the activated complex), which then gives the products.
(B) The molecules collide with the threshold energy.
(A) The colliding molecules are properly oriented, so the right atoms come into contact.
(C) The intermediate (activated complex) is formed.
(D) The intermediate breaks up into the products.
Shortcut: The collision (B) comes first and product formation (D) last; this leaves Options (1) and (4). The intermediate forms only from a properly oriented collision, so (A) comes before (C): Option (1).