Chapter30: Orbitals And Organic Chemistry: Pericyclic Reactions
Section30.7: Sigmatropic Rearrangements
Problem 7P
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How do I know this spontaneous?
![Consider the following reaction:
H
H,
H-0
Br
H-O-
Br
Me
Me
AH (bonds broken) = 285 kJ/mol
AH (bonds formed) = 381 kJ/mol
The energy diagram for this transformation is shown below:
E
H,
H-O
-Br
Me
H
H-0
Br
Me
Reaction Coordinate
1. The rate equation has been experimentally established for the above transformation. Which of the following rate
equation is true?
a) rate = k[CH3CH,Br]
b) rate = k[HO¯]ICH;CH,Br]
c) rate = k[HO¯] [CH,CH,Br]²
d) rate = k[CH,CH,OH][Br]
e) rate = k[CH,CH,OH]
2. Which of the following statements is true?
a) AG, AH, AS, and Kegare kinetic factors.
b) The position of equilibrium will be significantly affected by an increase in temperature.
c) The reaction is endothermic.
d) The entropy of system is positive.
e) The reaction is spontaneous.
3. Which of the following statements is not true?
a) Activation energy and temperature are kinetic factors.
b) The rate will be faster by an increase in temperature.
c) If the concentration of hydroxide is doubled, the rate will be doubled.
d) Based on the Hammond postulate, the transition state is close in structure to the products.
e) The reaction follows the second order kinetics.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6138bddb-2563-44bd-98e8-e6cb81a99c21%2Fccba0413-b752-469d-91f3-a63f005b57eb%2Fkox6sis_processed.png&w=3840&q=75)
Transcribed Image Text:Consider the following reaction:
H
H,
H-0
Br
H-O-
Br
Me
Me
AH (bonds broken) = 285 kJ/mol
AH (bonds formed) = 381 kJ/mol
The energy diagram for this transformation is shown below:
E
H,
H-O
-Br
Me
H
H-0
Br
Me
Reaction Coordinate
1. The rate equation has been experimentally established for the above transformation. Which of the following rate
equation is true?
a) rate = k[CH3CH,Br]
b) rate = k[HO¯]ICH;CH,Br]
c) rate = k[HO¯] [CH,CH,Br]²
d) rate = k[CH,CH,OH][Br]
e) rate = k[CH,CH,OH]
2. Which of the following statements is true?
a) AG, AH, AS, and Kegare kinetic factors.
b) The position of equilibrium will be significantly affected by an increase in temperature.
c) The reaction is endothermic.
d) The entropy of system is positive.
e) The reaction is spontaneous.
3. Which of the following statements is not true?
a) Activation energy and temperature are kinetic factors.
b) The rate will be faster by an increase in temperature.
c) If the concentration of hydroxide is doubled, the rate will be doubled.
d) Based on the Hammond postulate, the transition state is close in structure to the products.
e) The reaction follows the second order kinetics.
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