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Multistep Reaction Energy Profile

AP Chemistry· difficulty 3/5

A two-step mechanism shows two transition states. TS2 is higher in energy than TS1.

TS1 TS2 (highest) Reaction progress

Which step is the rate-determining step?

  • A

    Both equal

  • B

    The fastest step

  • C

    Step 2 (TS2 has highest Ea)

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  • D

    Step 1 (always the first step)

Explanation

The rate-determining step has the highest activation energy. TS2 is highest, so step 2 is rate-determining.

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