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Chapter 6: Problem 6.20 (page 233)

Draw an energy diagram for a two-step reaction, A→B→C, where the relative energy of these compounds is C<A<B, and the conversion of B→Cis rate-determining.

Short Answer

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Answer

The energy diagram is as follows:

Step by step solution

01

Step-by-Step SolutionStep 1: Energy diagram

An energy diagram (energy vs. reaction coordinate) is used to describe the change in energy of a system during the conversion of the reactants to the products.

02

Rate determining step

The step (in a chemical reaction) that takes the maximum time in the conversion of the reactants to products is termed the rate-determining step.

The rate-determining step has the maximum activation energy barrier.

03

Energy diagram of the given reaction

The reaction involves the transformation of the reactant A to product C through an intermediate B.

Species C has the lowest energy, and B has the highest energy.

Since it is given that the conversion of B to C is the rate-determining step, the activation energy barrier between B and C will be the maximum.

Energy diagram of a two-step reaction

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Most popular questions from this chapter

For each rate equation, what effect does the indicated concentration change have on the overall rate of the reaction?

[1] rate=k[CH3CH2Br][-OH]

  1. tripling the concentration of CH3CH2Bronly
  2. tripling the concentration of – OH only
  3. tripling the concentration of both CH3CH2Br and – OH

[2]role="math" localid="1648280223497" rate=k[(CH3)3COH]

  1. doubling the concentration of (CH3)3COH
  2. increasing the concentration of (CH3)3COH by a factor of 10

PGF2α (Section 4.15) is synthesized in cells using a cyclooxygenase enzyme that catalyzesa multistep radical pathway. Two steps in the pathway are depicted in the accompanying equations.

(a) Draw in curved arrows to illustrate how C is converted to D in Step [1].

(b) Identify Y, the product of Step [2], using the curved arrows that are drawn on compound D.

Explain why HC≡CHis more acidic than CH3CH3, even though the C-H bond in HC≡CHhas a higher bond dissociation energy than the C-H bond in CH3CH3.

Given each of the following values, is the starting material or product favored at equilibrium?

a.Keq=5.5

b.ΔG°=40kJ/mol

Consider the following energy diagram

  1. How many steps are involved in this reaction?
  2. Label ∆H°and Ea for each step, and label∆H°overall .
  3. Label each transition state.
  4. Which point on the graph corresponds to a reactive intermediate?
  5. Which step is rate-determining?
  6. Is the overall reaction endothermic or exothermic?
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