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AP Chemistry
5.10 Multistep Reaction Energy Profile
5.6 Reaction Energy Profile
AdvancedMCQDrawing RepresentationsGraphicalConceptual13.1k
A grayscale reaction energy profile plotted on a two-dimensional Cartesian plane. The horizontal axis is labeled 'Reaction Coordinate' and has no numerical ticks. The vertical axis is labeled 'Potential Energy (kJ/mol)' with numerical tick marks at 0, 20, 40, 60, 80, 100, and 120. A single continuous solid black curve depicts a three-step mechanism: the curve begins with a flat plateau at 40 labeled '\( \text{X} \)', rises to a first smooth peak at 110 labeled '\( \text{TS}_1 \)', descends to a local minimum at 80 labeled '\( \text{Y}_1 \)', rises to a second peak at 100 labeled '\( \text{TS}_2 \)', descends to a second local minimum at 20 labeled '\( \text{Y}_2 \)', rises to a third peak at 110 labeled '\( \text{TS}_3 \)', and descends to a final flat plateau at 0 labeled '\( \text{Z} \)'. No other curves, gridlines, labels, text, or annotations appear.
Potential energy diagram for the multistep conversion of \( \text{X}(g) \) to \( \text{Z}(g) \).
A proposed three-step mechanism for the gas-phase reaction \[ \text{X}(g) \rightarrow \text{Z}(g) \] proceeds via two reaction intermediates, \( \text{Y}_1(g) \) and \( \text{Y}_2(g) \), through transition states \( \text{TS}_1 \), \( \text{TS}_2 \), and \( \text{TS}_3 \). The potential energy profile for the reaction is shown below.

Which of the following correctly ranks the species from greatest to least thermodynamic stability, and identifies the rate-determining step for the forward reaction?

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