Consider the following four energy diagrams: (a) Which diagrams correspond with

Question

Consider the following four energy diagrams: (a) Which diagrams correspond with a two-step mechanism? (b) Which diagrams correspond with a one-step mechanism? (c) Compare energy diagrams A and C. Which has a relatively larger E_a? (d) Compare diagrams A and C. Which has a negative Delta G? (e) Compare diagrams A and D. Which has a positive Delta G? (f) Compare all four energy diagrams. Which one exhibits the largest E_a? (g) Which processes will have a value of K_eq that is greater than 1? (h) Which process will have a value of K_eq that is roughly equal to 1?

Explanation / Answer

Ans 6.27 a) The diagrams B and D shows the formation of intermediate hence it has a two step mechanism.

B) diagrams A and C do not show formation of any intermediate. Direct production of products take place from the reactants hence they have a one step mechanism.

C) diagram C. The reactants in C have a very low potential energy as compared to that of A and has relatively larger activation energy As depicted from the diagram.

D) diagram A. The products in diagram A have lower energy as compared to that of reactants such that the difference of their free energies becomes negative.

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