Question

4. Consider the reaction energy diagram below. Consider the "potential energy" to be equal to enthalpy. Potential energy Reaction progress First, indicate on the diagram the activation energy, transition state, and the change of enthalpy for every step of this step-wise process, as well as the change in enthalpy for the overall reaction. Then, answer the following questions: (i) How many elementary steps are there in the mechanism of this reaction? (ii) Which of these steps is the rate-determining step? (iii) How many of the individual steps are exothermic? (iv) Is the overall reaction endothermic or exothermic? (v) How many intermediates are there in the mechanism? (vi) How many transition states are there in this mechanism? (vii) Which transition state is highest in energy? A. i) = 3 steps, ii) = 1st step (A to B), iii) = 2 steps, iv) = endothermic, v) = 3 intermediates, vi) = 2 transition states, vii) 2nd transition state B. i) = 4 steps, ii) = 2nd step (B to C), iii) = 2 steps, iv) = endothermic, v) = 2 intermediates, vi) = 2 transition states, vii) 1" transition state C. i) = 3 steps, ii) = 3rd step (C to D), ii) = 1 step, iv) = exothermic, v) = 2 intermediates, vi) = 3 transition states, vii) 1" transition state D. i) = 3 steps, ii) = 2nd step (B to C), ii) = 1 step, iv) = endothermic, v) = 2 intermediates, vi) = 3 transition states, vii) 2nd transition state E. i) = 4 steps, ii) = 2nd step (B to C), iii) = 1 step, iv) = exothermic, v) = 2 intermediates, vi) = 2 transition states, vii) 2nd transition state F. i) = 3 steps, ii) = 2nd step (B to C), iii) = 1 step, iv) = endothermic, v) = 2 intermediates, vi) = 3 transition states, vii) 3rd transition state

Answer 1

activation energy Rechen i) There are 3 steps A=B B C ح cŽD i) The determinant step is B C because it is the highest erg id) Only one step B C because it lacks ener in) There is an endo termic reaction because final enthalpy is - higher than the initral one wu) There are 2 intermediates, these are the amount of lowers energy compounds but reagents and products wwThere are '3 transition states, there are that compounds with higher energy respect with intermediates V*) This compound as the intermediate between B and C Correct option is D