Consider a reaction that occurs by the following mechanism:
A + BC → AC + B
AC + D → A + CD
The potential energy profile for this reaction is shown below.
-Transition states occur at which reaction stages?

Question

Consider a reaction that occurs by the following mechanism:
A + BC → AC + B
AC + D → A + CD
The potential energy profile for this reaction is shown below. 
-Transition states occur at which reaction stages?

Quizplus · Accepted Answer

Transition states are points on the potential energy profile where the reactants have the highest potential energy before they form the products. In this reaction mechanism, there are two possible transition states: one between A and BC (reaction stage 2) and one between AC and D (reaction stage 4). Therefore, the correct choice is C, which includes both reaction stages 2 and 4.

Consider a Reaction That Occurs by the Following Mechanism