The mechanism of the reaction: A + 2B → D + E; ΔH = -ve is Step I: A + 2B → C (slow), Step II: C → D + E (fast). The energy profile of the reaction should be:

Question

Prashant Kotian · Accepted Answer

Correct answer: D. The overall reaction is exothermic (ΔH = -ve), so the final products (D + E) must be at a lower energy level than the reactants (A + 2B). Step I is slow (rate-determining), so the first activation energy peak must be higher than the second peak. Graph (d) matches these criteria. Therefore, correct answer is D.

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