In a bimolecular reaction, the steric factor P was experimentally determined to be 4.5. The correct option(s) among the following is(are)
- (A)The activation energy of the reaction is unaffected by the value of the steric factor✓ Correct
- (B)Experimentally determined value of frequency factor is higher than that predicted by Arrhenius equation✓ Correct
- (C)Since , the reaction will not proceed unless an effective catalyst is used
- (D)The value of frequency factor predicted by Arrhenius equation is higher than that determined experimentally
Answer: (A), (B)
Solution
The steric factor relates the experimental frequency factor to the theoretical collision frequency : .
[A] Correct: Activation energy is an intrinsic property of the reaction and is independent of the steric factor.
[B] Correct: A steric factor indicates that the experimental frequency factor is higher than predicted by simple collision theory. This can occur when the reaction has favorable orientational or electronic factors.
[C] Incorrect: A steric factor greater than 1 does not prevent the reaction; it actually indicates enhanced reactivity.
[D] Incorrect: This is the opposite of [B]; the experimental value is higher, not lower.
[A] Correct: Activation energy is an intrinsic property of the reaction and is independent of the steric factor.
[B] Correct: A steric factor indicates that the experimental frequency factor is higher than predicted by simple collision theory. This can occur when the reaction has favorable orientational or electronic factors.
[C] Incorrect: A steric factor greater than 1 does not prevent the reaction; it actually indicates enhanced reactivity.
[D] Incorrect: This is the opposite of [B]; the experimental value is higher, not lower.
JEE Advanced · 2017 · 21 May 2017 · Paper 2 · One or more correct options