May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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14Rate Equations Reaction MechanismsMedium1 mark
The reaction pathway diagram shows the reaction which occurs when reacts with OH.
Reaction pathway diagram: energy (vertical axis) against progress of reaction (horizontal axis). The curve starts at a level for the reactants, rises to a tall first peak, dips to a shallow trough below that peak (the intermediate carbocation), rises again to a second, lower peak, then falls to a final level below the level it started at, showing the reaction is exothermic overall.
Which statements are correct?
statement 1statement 2
Arate of formation of from is slower than rate of formation of from the overall reaction is exothermic
Brate of formation of from is slower than rate of formation of from the overall reaction is endothermic
Crate of formation of from is faster than rate of formation of from the overall reaction is exothermic
Drate of formation of from is faster than rate of formation of from the overall reaction is endothermic