Question

For the reaction shown in Scheme 1, the concentration profiles of different species are provided. 
\(\text{Scheme 1:}\) 

Based on this graph, the correct condition(s) regarding the rate constants is(are) 
 

• A. \(k_2 > k_4\)
• B. \(k_3 > k_1\)
• C. \(k_2 > k_1\)
• D. \(k_1 = k_2\)

Hint:

When analyzing reaction rate constants from concentration-time profiles, look at the relative rates of change for each species to infer the relationship between the rate constants.

Answer 1

The Correct Option is A, B, C

Step 1: Analysis of the graph:

1. [R] decreases rapidly - R is consumed quickly
2. [S] shows a peak then decreases - S is an intermediate that forms and then gets consumed
3. [Q] increases then levels off - Q accumulates as an intermediate
4. [P] increases steadily - P is the final product

Step 2: Key observations:

• S peaks early and stays low → S is consumed faster than it's produced → k₃ > k₁
• Q accumulates significantly → Q is produced faster than it's consumed → k₂ > k₄
• R depletes faster via k₂ than k₁ (since Q accumulates more than S) → k₂ > k₁

Answer: (A), (B), and (C) are correct.