A simplified version of the computed energy profile for the Wittig reaction of a stabilised ylide that we saw in the Introduction is shown below, with energy differences in kJ mol¹¹. Ph 120 OMe Ald + Ylide 42 Ph k₁ Oxaphosphetane (OP) K-1 24 OP CO₂Me that k_₂ 200 Ph CO₂Me Alk + Oxide Remember that rate constants k are related to activation energies E₂: k = Ae-Ea/RT (R = 0.00831 kJ mol-¹ K-¹) 1. Which is the rds? 2. Predict the rate equation. 3. Assuming that the A values for the steps are all 10¹0, calculate the rate constants k₂, k.₁, k₂ and k.₂ at 350 K. 4. Is the 2nd step reversible at 350 K?

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