
Concept explainers
(a)
Interpretation:
The equilibrium constant for interconversion of given
Concept introduction:
The free energy diagram of a reaction is the plot of standard free energy versus reaction coordinate or reaction progress. The products and reactants are placed at their respective free energy. The difference in the free energy of products and reactants is the standard free energy of the reaction.

Answer to Problem 4.68AP
The equilibrium constant for interconversion of given alkenes is
The alkene that is more favorable is shown below.
Explanation of Solution
The given alkenes undergoing interconversion along with their free energy of formation are shown below.
Figure 1
The free energy change for the interconversion of alkenes is equal to the free energy of formation of the product minus the free energy of formation of the reactant.
Substitute the free energy of formation of product alkene and reactant alkene in the equation (1) as shown below.
The Gibbs free energy of the reaction is related to its equilibrium constant by the relation shown below.
Where,
•
•
The value of
Substitute the value of
Rearrange above equation to calculate the
Take the antilog on both sides of the equation as shown below.
The equilibrium constant for the interconversion of alkenes is
The value of equilibrium constant is high, therefore, the alkene on the product is more favored. This can also be understood from the negative value of Gibbs free energy of the reaction which indicates that the reaction is spontaneous. Therefore, alkene on the product side is more favorable which is shown below.
Figure 2
The equilibrium constant for interconversion of given alkenes is
The alkene that is more favorable is shown in Figure 2.
(b)
Interpretation:
The information of the rate at which the interconversion is taking place from the equilibrium constant value is to be stated.
Concept introduction:
The equilibrium constant of the reaction gives information about the

Answer to Problem 4.68AP
The rate of interconversion of alkene is moderate. The rate of forward reaction is
Explanation of Solution
The equilibrium constant in terms of the concentration of reactant alkene and product alkene is shown below.
The value of the equilibrium constant is
Substitute the value of the equilibrium constant in the above expression.
The concentration of product alkene at equilibrium is only
The equilibrium constant of the reaction is the ratio of rate constant of forward reaction and backward reaction.
The rate of interconversion of alkene is moderate from the value of the equilibrium constant.
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Chapter 4 Solutions
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