The observed rate of a chemical reaction is substantially lower than the collision frequency. One or more of the following statements is/are true to account for this fact.
A. The reactants do not have the required energy.
B. The reactants do not collide in the proper orientation.
C. Collision complex exists for a very short time.
D. Collision frequency overestimates the number of effective collisions.
The true statements are:

A, B and C

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A, B and D

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B, C and D

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A, C and D

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Solution

The correct option is A A, B and C
The given statement is the rate of a chemical reaction is substantially lower then collision frequency the statement gives the condition
reactant do not have required energy and the reactant do not have the proper orientation and this reaction formed collision complex exists a very short time

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Similar questions

Which of the following statements is incorrect about the collision theory of chemical reaction?

(a) It considers reacting molecules or atoms to be hard spheres and ignores their structural features
(b) Number of effective collisions determines the rate of reaction
(c) Collision of atoms or molecules possessing sufficient threshold energy results into the product formation
(d) Molecules should collide with sufficient threshold energy and proper orientation for the collision to be effective

Q. Which of the following is not correct reason for the substantially lower rate of reaction than the collision frequency?

Explain:

The molecules during collisions attain threshold energy and only then they result in chemical reaction. Certain collisions inspite of possessing thr es hold energy do not result in chemical reactions. This is because the orientation of collisions is not suitable for a chemical reaction. Thus, the collisions which are associated with threshold energy and
proper orientation only result in chemical reaction.

Q. Statement - I : Every collision of reactant molecule is not successful.
Statement - II: Every collision of reactant molecule with proper orientation is successful one.

Q. Based on knowledge of collisions and orientation factors for reactions, which of the following non-elementary reactions would be more likely to have the highest rate constant for a given temperature presuming all reactants are in equal concentrations?

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