Question

9. Consider the SN2 reaction: A + B-C ? A-B + C If the concentrations of both reactants, A and B-C are tripled, the rate of the reaction will A. remain the same B. increase three-fold C. increase four-fold D. increase six-fold E. increase nine-fold F. increase twenty seven 10. Why do polar solvents accelerate the SN1 haloalkane reaction? A. Because polar solvents stabilize the nucleophile. B. Because polar solvents stabilize the transition state. C. Because polar solvents stabilize the haloalkane. D. Because polar solvents are attracted to the leaving group more than non-polar solvents. E. It is not true that polar solvents accelerate SN1 reaction, actually the rate decreases. 11. Which of the following alkenes exhibit E-Z isomerism? I. 1-chloropropene II. 2-chloropropene III. 3-chloropropene A. only I B. only II C. only III D. I and II E. I and III F. II and III G. I, II and III 12. Identify this major product of the following reaction. H3C CH3 OH H2SO4 / heat CH3 CH3 CH3 H3C CH3 CH3 A) B) C) D) 13. Which of the following has a meso stereoisomer? I. 2,4-dichloropentane II. 1,3-dimethylcyclopentane III. 2,3-dichloropentane A. only I B. only II C. only III D. I and II E. II and III F. I and III G. I, II and III 14. Select the best base to quantitatively remove a proton from acetylene. A. NH3 B. NaNH2 C. NaOH D. NaOCH2CH3 E. H 15. Which of the following gives only one organic product on ozonolysis? (3 pts) A. 2-heptyne B. 3-heptyne C. 2-hexyne D. 3-hexyne E. All of the above F. None of the above 16. Which species below is the intermediate in the free radical addition of HBr to 1-butene? A) H3C-CH2-CH-CH3 B) H3C-CH2-CH-CH2Br C) H3C-CH2-CH2-CH2 D) H3C-CH2-CH-CH2 Br E). None of the above. The intermediate is a carbocation. 17. In the Friedel-Crafts alkylation of benzene, dialkylation is often a significant by-product. In Friedel-Crafts acylation of benzene, diacylation is not a significant by-product. Which of the following is the primary reason for this difference? A. Alkyl groups activate the ring to further substitution, acyl groups deactivate it. B. Alkyl groups are less sterically hindered than acyl groups. C. Acyl cations are more difficult to make with Lewis acids. D. Unlike acyl cations, carbocations can undergo rearrangements. E. Acyl carbocations are much more stable than alkyl carbocations. 18. Which of the following is a conjugated diene? A. 1,2-heptadiene B. 2,4-heptadiene C. 1,4-heptadiene D. 1,6-heptadiene E. All of the above are conjugated dienes.

          9. Consider the SN2 reaction: A + B-C ? A-B + C
If the concentrations of both reactants, A and B-C are tripled, the rate of the reaction will
A. remain the same B. increase three-fold C. increase four-fold
D. increase six-fold E. increase nine-fold F. increase twenty seven
10. Why do polar solvents accelerate the SN1 haloalkane reaction?
A. Because polar solvents stabilize the nucleophile.
B. Because polar solvents stabilize the transition state.
C. Because polar solvents stabilize the haloalkane.
D. Because polar solvents are attracted to the leaving group more than non-polar solvents.
E. It is not true that polar solvents accelerate SN1 reaction, actually the rate decreases.
11. Which of the following alkenes exhibit E-Z isomerism?
I. 1-chloropropene II. 2-chloropropene III. 3-chloropropene
A. only I B. only II C. only III D. I and II
E. I and III F. II and III G. I, II and III
12. Identify this major product of the following reaction.
H3C CH3 OH H2SO4 / heat
CH3 CH3 CH3 H3C CH3 CH3
A) B) C) D)
13. Which of the following has a meso stereoisomer?
I. 2,4-dichloropentane II. 1,3-dimethylcyclopentane III. 2,3-dichloropentane
A. only I B. only II C. only III D. I and II
E. II and III F. I and III G. I, II and III
14. Select the best base to quantitatively remove a proton from acetylene.
A. NH3 B. NaNH2 C. NaOH D. NaOCH2CH3 E. H
15. Which of the following gives only one organic product on ozonolysis? (3 pts)
A. 2-heptyne B. 3-heptyne C. 2-hexyne D. 3-hexyne
E. All of the above F. None of the above
16. Which species below is the intermediate in the free radical addition of HBr to 1-butene?
A) H3C-CH2-CH-CH3 B) H3C-CH2-CH-CH2Br C) H3C-CH2-CH2-CH2
D) H3C-CH2-CH-CH2 Br E). None of the above. The intermediate is a carbocation.
17. In the Friedel-Crafts alkylation of benzene, dialkylation is often a significant by-product. In Friedel-Crafts acylation of benzene, diacylation is not a significant by-product. Which of the following is the primary reason for this difference?
A. Alkyl groups activate the ring to further substitution, acyl groups deactivate it.
B. Alkyl groups are less sterically hindered than acyl groups.
C. Acyl cations are more difficult to make with Lewis acids.
D. Unlike acyl cations, carbocations can undergo rearrangements.
E. Acyl carbocations are much more stable than alkyl carbocations.
18. Which of the following is a conjugated diene?
A. 1,2-heptadiene B. 2,4-heptadiene C. 1,4-heptadiene D. 1,6-heptadiene
E. All of the above are conjugated dienes.

9. Consider the SN2 reaction: A + B-C ? A-B + C
If the concentrations of both reactants, A and B-C are tripled, the rate of the reaction will
A. remain the same B. increase three-fold C. increase four-fold
D. increase six-fold E. increase nine-fold F. increase twenty seven
10. Why do polar solvents accelerate the SN1 haloalkane reaction?
A. Because polar solvents stabilize the nucleophile.
B. Because polar solvents stabilize the transition state.
C. Because polar solvents stabilize the haloalkane.
D. Because polar solvents are attracted to the leaving group more than non-polar solvents.
E. It is not true that polar solvents accelerate SN1 reaction, actually the rate decreases.
11. Which of the following alkenes exhibit E-Z isomerism?
I. 1-chloropropene II. 2-chloropropene III. 3-chloropropene
A. only I B. only II C. only III D. I and II
E. I and III F. II and III G. I, II and III
12. Identify this major product of the following reaction.
H3C CH3 OH H2SO4 / heat
CH3 CH3 CH3 H3C CH3 CH3
A) B) C) D)
13. Which of the following has a meso stereoisomer?
I. 2,4-dichloropentane II. 1,3-dimethylcyclopentane III. 2,3-dichloropentane
A. only I B. only II C. only III D. I and II
E. II and III F. I and III G. I, II and III
14. Select the best base to quantitatively remove a proton from acetylene.
A. NH3 B. NaNH2 C. NaOH D. NaOCH2CH3 E. H
15. Which of the following gives only one organic product on ozonolysis? (3 pts)
A. 2-heptyne B. 3-heptyne C. 2-hexyne D. 3-hexyne
E. All of the above F. None of the above
16. Which species below is the intermediate in the free radical addition of HBr to 1-butene?
A) H3C-CH2-CH-CH3 B) H3C-CH2-CH-CH2Br C) H3C-CH2-CH2-CH2
D) H3C-CH2-CH-CH2 Br E). None of the above. The intermediate is a carbocation.
17. In the Friedel-Crafts alkylation of benzene, dialkylation is often a significant by-product. In Friedel-Crafts acylation of benzene, diacylation is not a significant by-product. Which of the following is the primary reason for this difference?
A. Alkyl groups activate the ring to further substitution, acyl groups deactivate it.
B. Alkyl groups are less sterically hindered than acyl groups.
C. Acyl cations are more difficult to make with Lewis acids.
D. Unlike acyl cations, carbocations can undergo rearrangements.
E. Acyl carbocations are much more stable than alkyl carbocations.
18. Which of the following is a conjugated diene?
A. 1,2-heptadiene B. 2,4-heptadiene C. 1,4-heptadiene D. 1,6-heptadiene
E. All of the above are conjugated dienes.

Added by Andre W.

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