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JEE Main · 2019 · 09 Apr 2019 · Shift 2 · Haloalkanes and Haloarenes

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Which of the following potential energy (PE) diagrams represents the reaction?
  1. (A)(see structure)
  2. (B)(see structure)
  3. (C)(see structure)
  4. (D)(see structure)
    ✓ Correct

Answer: (D)

Solution

An reaction proceeds in two steps through a carbocation intermediate, so its energy profile shows two maxima separated by a shallow minimum. The first step, ionisation to form the carbocation, is rate-determining and therefore carries the higher barrier, so the correct profile is the one whose first hump is taller than the second with a dip between them.

JEE Main · 2019 · 09 Apr 2019 · Shift 2 · Single correct option

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