How many intermediates arc formed in the reaction? Which letters represent trans

Question

How many intermediates arc formed in the reaction? Which letters represent transition states? What is the fastest step in the reaction? Which is more stable, A or G? Does A or E form faster from C? What is the reactant of the rate-determining step? Is the first step of the reaction exergonic or endergonic? Is the overall reaction exergonie or endergonie? Which is the more stable intermediate? Which step in the forward direction has the largest rate constant? Which step in the reverse direction has the smallest rate constant?

Explanation / Answer

(a) There are two intermidiates (C and E).

(b) B, D and F are the transition states.

(c) A to C is the fastest step, since the transition B has the least free energy.

(d) G is more stable, since the free energy of G is less than that of A.

(e) A forms faster from C, since the free energy of transition state B (to form A from C) has lower than that of D (to form E from C).

(f) Rate determining step is the slowest step. Here C to E is the slowest step, since it passes through the highest energy transition state D. The reactant for slowest step is C.

(g) First step is endergonic. Since energy of C (product) has higher than A (reactant).

(h) The overall reaction is exergonic. Since energy of A (reactant) has higher than G (product).

(i) C is the most stable intermidiate. Since free energy of C < E.

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