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)
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)
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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.
Updated On: Dec 5, 2025
- \(k_2 > k_4\)
- \(k_3 > k_1\)
- \(k_2 > k_1\)
- \(k_1 = k_2\)
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The Correct Option is A, B, C
Solution and Explanation
Step 1: Analysis of the graph:
- [R] decreases rapidly - R is consumed quickly
- [S] shows a peak then decreases - S is an intermediate that forms and then gets consumed
- [Q] increases then levels off - Q accumulates as an intermediate
- [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.
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