Chapter 6
Chapter 6
Chapter 6
1) Which of the following best describes the carbon-chlorine bond of an alkyl chloride?
A) nonpolar; no dipole
B) polar; δ+ at carbon and δ- at chlorine
C) polar; δ- at carbon and δ+ at chlorine
D) ionic
E) none of the above
Answer: B
Diff: 1
Section: 6.4
LO: 6.1
MCAT LO: MCAT6.1
1
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3) The flame retardant below has been found to be an androgen agonist and may have a
contribution to an increasing rate of occurrence of prostate cancer (J. Med. Chem. 2006, 7366).
What is the correct term that describes the relative position of the bromides in this structure?
A) geminal
B) vinyl
C) vicinal
D) aryl
Answer: C
Diff: 1
Section: 6.2
LO: 6.1
GO: G2, G5
MCAT LO: MCAT6.1
A) primary chloride
B) secondary chloride
C) tertiary chloride
D) vinyl chloride
E) benzyl chloride
Answer: C
Diff: 1
Section: 6.2
LO: 6.1
MCAT LO: MCAT6.1
2
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5) Provide the name of the bromoalkane shown below.
Answer: 3-bromo-4-ethylheptane
Diff: 1
Section: 6.2
LO: 6.1
MCAT LO: MCAT6.1
Diff: 1
Section: 6.2
LO: 6.1
MCAT LO: MCAT6.1
4
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14) Which of the following is a vicinal dihalide?
A) cis-1,2-dibromocyclopentane
B) 3,3-dichloropentane
C) trans-1,4-diiodocyclohexane
D) isobutyl chloride
E) 1,3-dibromoheptane
Answer: A
Diff: 2
Section: 6.2
LO: 6.1
MCAT LO: MCAT6.1
5
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17) What is the IUPAC name of the compound shown below?
A) (1S,3S)-1,3-dichloro-1-ethyl-3-methylcyclopentane
B) (1R,3S)-1,3-dichloro-1-methyl-3-ethylcyclopentane
C) (1R,4S)-1,4-dichloro-1-ethyl-4-methylcyclopentane
D) (1R,3S)-1,3-dichloro-1-ethyl-3-methylcyclopentane
E) (1S,3R)-1,3-dichloro-3-ethyl-1-methylcyclopentane
Answer: D
Diff: 2
Section: 6.2
LO: 6.1
MCAT LO: MCAT6.1
A) (2R,3S,4S)-2-chloro-3,4-dibromo-3-methylhexane
B) (2R,3S,4S)-3,4-dibromo-2-chloro-3-methylhexane
C) (3S,4S,5S)-3,4-dibromo-5-chloro-4-methylhexane
D) (2R,3R,4S)-3,4-dibromo-2-chloro-3-methylhexane
E) (2R,3S,4R)-3,4-dibromo-2-chloro-3-methylhexane
Answer: B
Diff: 2
Section: 6.2
LO: 6.1
MCAT LO: MCAT6.1
6
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19) Provide an acceptable name for the compound shown below.
Answer: 4-bromo-1,1-dimethylcyclohexane
Diff: 2
Section: 6.2
LO: 6.1
MCAT LO: MCAT6.1
21) The following structure is a proteasome inhibitor that may find application in treating
cervical cancer (J. Med. Chem. 2011, 449). The halides in this structure may be classified as
________ and ________.
A) vicinal; vinyl
B) vicinal; aryl
C) vinyl; aryl
D) vinyl; geminal
Answer: B
Diff: 2
Section: 6.2
LO: 6.1
GO: G5
MCAT LO: MCAT6.1
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22) Name the haloalkane shown. Be sure to include the appropriate R or S description if needed.
Answer: (3R,4R,6S)-4-ethyl-1,6-difluoro-3-methylheptane
Diff: 2
Section: 6.2
LO: 6.1
MCAT LO: MCAT6.1
23) Name the haloalkane shown. Be sure to include the appropriate R or S description if needed.
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25) Which of the following best describes DDT?
A) a chlorocarbon used to decaffeinate coffee beans
B) a polybrominated organic compound used as a herbicide
C) a Freon used as a foaming agent
D) a mixed alkyl halide used as an anesthetic
E) a polychlorinated organic compound used as an insecticide
Answer: E
Diff: 2
Section: 6.3
LO: 6.1
GO: G5
MCAT LO: MCAT6.1
26) Which of the following alkyl halides has the smallest molecular dipole moment?
A) CH3F
B) CH3Cl
C) CH2I2
D) CH2Cl2
E) CF4
Answer: E
Diff: 2
Section: 6.4
MCAT LO: MCAT6.4
27) Although F is more electronegative than Cl, the C-Cl bond has a larger dipole moment than
the Explain.
Answer: The bond dipole moment is determined by a product of the amount of charge
separation and the distance over which the charge is separated, Although δ is larger
in the the greater length of the ultimately makes its dipole moment larger.
Diff: 3
Section: 6.4
MCAT LO: MCAT6.4
28) Among the following alkyl halides, choose the one with the lowest boiling point.
A) t-butyl chloride
B) n-butyl chloride
C) t-butyl bromide
D) n-butyl iodide
E) t-butyl iodide
Answer: A
Diff: 2
Section: 6.5
LO: 6.1
MCAT LO: MCAT6.1
29) Arrange the following alkyl halides in order of increasing boiling point:
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CH3CH2Br, CH3CH2CH2Br, (CH3)2CHBr, CH3CH2F.
Answer: CH3CH2F < CH3CH2Br < (CH3)2CHBr < CH3CH2CH2Br
Diff: 2
Section: 6.5
LO: 6.1
MCAT LO: MCAT6.1
30) When water is shaken with dichloromethane, a two-phase system results. Which compound
forms the upper phase? Explain.
Answer: Water is less dense than dichloromethane and therefore forms the upper phase.
Diff: 2
Section: 6.5
LO: 6.1
GO: G5
MCAT LO: MCAT6.1
10
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32) Draw two reasonable resonance structures and the hybrid of the intermediate formed in the
following reaction.
Diff: 2
Section: 6.6
LO: 6.2
MCAT LO: MCAT6.5
Answer:
Diff: 2
Section: 6.6
LO: 6.2
11
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34) Provide the structure of the major organic product in the reaction below.
Answer:
Diff: 2
Section: 6.6
LO: 6.2
35) Provide the structure of the major organic product in the reaction below.
Answer:
Diff: 2
Section: 6.6
LO: 6.2
12
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36) Draw the structures of the two major products formed in the following reaction. Indicate
which of the two structures would be predicted to predominate under thermodynamic condition
and explain why.
Answer: Reactivity of allylic hydrogens due to resonance stability of the radical intermediate
would result in the the formation of two major substitution products:
1 2
37) Consider the reaction of (CH3)3CO- with iodomethane. Will the reaction rate increase,
decrease, or remain the same if the concentration of iodomethane is increased? Explain.
Answer: This is an SN2 reaction with a The reaction rate will
increase as [CH3I] increases.
Diff: 1
Section: 6.8
MCAT LO: MCAT6.3
13
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38) What type of intermediate is present in the SN2 reaction of cyanide with bromoethane?
A) carbocation
B) free radical
C) carbene
D) carbanion
E) This reaction has no intermediate.
Answer: E
Diff: 2
Section: 6.8
LO: 6.4
Diff: 2
Section: 6.8
LO: 6.4
40) Show how the following reaction might be constructed using an SN2 reaction by drawing
structures for the starting materials.
Answer:
Diff: 2
Section: 6.9
LO: 6.3
GO: G2
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41) Consider the substitution reaction shown below. By what mechanism will the reaction
proceed?
A) SN1
B) SN2
C) free radical reaction
D) There is not enough information to tell.
Answer: B
Diff: 1
Section: 6.17
LO: 6.7
42) Provide the structure of the major organic product in the following reaction.
(CH3)3N + CH3CH2CH2I →
Answer: [(CH3)3NCH2CH2CH3]+ I-
Diff: 2
Section: 6.9
LO: 6.3
MCAT LO: MCAT6.2
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44) Which of the following compounds is the most nucleophilic?
A) CH3SH
B) CH3OH
C) H2O
D) CH3CO2H
E) BF3
Answer: A
Diff: 2
Section: 6.10
LO: 6.6
45) Name one factor that is favorable for nucleophilicity but not for basicity.
Answer: polarizability
Diff: 2
Section: 6.10
49) Rank the species below in order of increasing nucleophilicity in hydroxylic solvents:
51) Which of the following solvents could be described as polar and protic?
A) ethanol
B) acetonitrile
C) dimethylformamide
D) acetone
E) 18-crown-6
Answer: A
Diff: 3
Section: 6.10
LO: 6.2
52) What type of solvent is best for SN2 reactions which employ anionic nucleophiles: polar,
protic solvents; polar, aprotic solvents; or nonpolar solvents? Explain.
Answer: Polar, aprotic solvents are best. These solvents have strong dipole moments to enhance
solubility of the anionic species but lack the ability to solvate the anion by hydrogen bonding.
Diff: 3
Section: 6.10
LO: 6.6
53) Which of the following compounds will undergo an SN2 reaction most readily?
A) (CH3)3CCH2I
B) (CH3)3CCl
C) (CH3)2CHI
D) (CH3)2CHCH2CH2CH2I
E) (CH3)2CHCH2CH2CH2Cl
Answer: D
Diff: 2
Section: 6.11
LO: 6.6
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54) Which of the following alkyl chlorides will undergo SN2 reaction most readily?
A) 1-chloro-4-methylpentane
B) 2-chloro-4-methylpentane
C) 2-chloro-3-methylpentane
D) 3-chloro-2-methylpentane
E) 2-chloro-2-methylpentane
Answer: A
Diff: 2
Section: 6.11
LO: 6.6
55) Arrange the following substrates in order of their increasing SN2 reactivity with NaCN:
56) List the following bromides in order of their increasing reactivity as substrates in SN2
reactions: PhBr, PhCH2Br, and PhCH(CH3)Br.
Answer: PhBr < PhCH(CH3)Br < PhCH2Br
Diff: 2
Section: 6.11
LO: 6.6
57) List the following alkyl halides in order of their increasing reactivity as substrates in SN2
reactions: 2-chlorobutane, 2-iodobutane, and 1-iodobutane.
Answer: 2-chlorobutane < 2-iodobutane < 1-iodobutane
Diff: 2
Section: 6.11
LO: 6.6
58) Do all primary iodides react with N3- at the same rate via the SN2 mechanism? Explain.
Answer: No, not all primary alkyl react with N3- at the same rate via the SN2 mechanism.
Some primary iodides are more hindered than others. (CH3)3CCH2I and CH3CH2I are both
primary, but (CH3)3CCH2I is significantly more hindered. Additionally, some primary iodides
have increased activity due to a benzylic or allylic positioning.
Diff: 2
Section: 6.11
LO: 6.6
GO: G2
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59) Do all primary alkyl iodides undergo SN2 reactions with sodium cyanide in DMSO at
identical rates? Explain.
Answer: No. All primary iodides are not equally accessible to attack by the CN-. Steric
hindrance varies among primary iodides.
Diff: 2
Section: 6.11
LO: 6.6
GO: G2
60) Which of the following alkyl chlorides would undergo substitution most rapidly when treated
with or Provide the
structure of the substitution product.
Answer: CH3CH2C CH
Diff: 2
Section: 6.11
LO: 6.6
62) Which of the following statements describe a favorable attribute of a leaving group? (More
than one answer is possible.)
A) The leaving group should be highly polarizable.
B) The lower the electronegativity of the leaving group the better.
C) Good leaving groups need to have low steric hindrance.
D) The departed leaving group should have low basicity.
Answer: A, D
Diff: 2
Section: 6.11
LO: 6.6
GO: G2
63) Which of the following alkyl halides reacts most rapidly via an SN2 reaction with NaCN?
A) 1-iodohexane
B) 1-fluorohexane
C) (R)-2-bromohexane
D) iodocyclohexane
E) 1-iodo-1-methylcyclohexane
Answer: A
Diff: 2
Section: 6.11
LO: 6.6
19
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64) SN2 reactions take place with ________ of stereochemistry at the center undergoing
substitution.
Answer: inversion
Diff: 1
Section: 6.12
LO: 6.3
65) Complete the following SN2 reaction by providing structures for the necessary starting
materials.
Answer:
Diff: 2
Section: 6.12
LO: 6.3
MCAT LO: MCAT6.2
66) Provide the major organic product of the SN2 reaction below.
Answer:
Diff: 2
Section: 6.12
LO: 6.3
MCAT LO: MCAT6.2
20
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67) Provide the major organic product of the reaction below.
Answer:
Diff: 2
Section: 6.12
LO: 6.2
MCAT LO: MCAT6.3
Answer:
Diff: 2
Section: 6.12
LO: 6.2
MCAT LO: MCAT6.3
69) Provide the structure of the major organic product which results when (S)-2-iodopentane is
treated with KCN in DMF.
Answer:
Diff: 2
Section: 6.12
LO: 6.3
MCAT LO: MCAT6.2
21
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70) Provide the structure of the major organic product in the following reaction.
Answer:
Diff: 2
Section: 6.12
LO: 6.3
MCAT LO: MCAT6.2
71) Which of the compounds below undergoes solvolysis in aqueous ethanol most rapidly?
A) cyclohexyl bromide
B) methyl iodide
C) isopropyl chloride
D) 3-chloropentane
E) 3-iodo-3-methylpentane
Answer: E
Diff: 2
Section: 6.13
LO: 6.6
72) Which of the following alkyl bromides undergoes solvolysis in aqueous methanol most
rapidly?
A) PhCHBrCH3
B) (CH3)2CHCH2CH2Br
C) (CH3)2CHCH2CHBrCH3
D) CH3CH2CH2CH2Br
E) PhBr
Answer: A
Diff: 2
Section: 6.13
LO: 6.6
73) Arrange the following compounds in order of increasing reactivity toward ethanol solvolysis:
t-butyl bromide, t-butyl iodide, isopropyl chloride, methyl iodide.
Answer: methyl iodide < isopropyl chloride < t-butyl bromide < t-butyl iodide
Diff: 2
Section: 6.13
LO: 6.6
22
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74) List the following bromides in order of their increasing reactivity as substrates in SN1
reactions: PhBr, PhCH2Br, and PhCH(CH3)Br.
Answer: PhBr < PhCH2Br < PhCH(CH3)Br
Diff: 2
Section: 6.13
LO: 6.6
75) List the following bromides in order of their increasing reactivity as substrates in SN1
reactions: 2-chlorobutane, 2-iodobutane, and 1-iodobutane.
Answer: 1-iodobutane < 2-chlorobutane < 2-iodobutane
Diff: 2
Section: 6.13
LO: 6.6
76) List the following bromides in order of their increasing reactivity as substrates in SN1
reactions: 1-iodo-1-ethylcyclopentane, chlorocyclopentane, and iodocyclopentane.
Answer: chlorocyclopentane < iodocyclopentane < 1-iodo-1-ethylcyclopentane
Diff: 2
Section: 6.13
LO: 6.6
77) Draw the highest energy transition state in the solvolysis of (CH3)3CI in CH3OH.
Answer:
Diff: 2
Section: 6.13
LO: 6.4
GO: G7
78) List the following compounds in order of increasing reactivity in an SN1 reaction.
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79) Which of the following alkyl halides reacts most rapidly via an SN1 solvolysis reaction in
hot methanol?
A) 1-iodohexane
B) 1-fluorohexane
C) (R)-2-bromohexane
D) iodocyclohexane
E) 1-iodo-1-methylcyclohexane
Answer: E
Diff: 2
Section: 6.13
LO: 6.6
GO: G2
80) Rank the following molecules in order of increasing relative rate of SN1 solvolysis with
methanol and heat (slowest to fastest reacting).
81) When t-butyl chloride undergoes solvolysis in a solvent mixture composed of 70%
water/30% acetone, the reaction rate is slower than when the same compound is solvolyzed in
80% water/20% acetone. Explain.
Answer: This is purely a solvent effect. The greater the percentage of water in this solvent
mixture, the more polar the solvent. The more polar the solvent, the more easily solvated the
developing carbocation and the more rapidly it is formed.
Diff: 3
Section: 6.13
LO: 6.6
GO: G2
24
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82) If the absolute configuration at an asymmetric carbon does not change during the course of a
reaction, the reaction is said to occur with ________ of stereochemistry.
Answer: retention
Diff: 1
Section: 6.14
LO: 6.3
MCAT LO: MCAT6.2
83) When a SN1 reaction of R-2-iodobutane takes place in hot methanol, the product ________.
A) is chiral
B) will rotate plane polarized light
C) is racemic
D) will undergo a hydride shift
E) none of the above
Answer: C
Diff: 2
Section: 6.14
LO: 6.2
85) Provide the structure of the major organic products which result in the reaction below.
Answer:
Diff: 2
Section: 6.14
LO: 6.3
MCAT LO: MCAT6.2
25
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86) SN1 reactions usually proceed with ________.
A) equal amounts of inversion and retention at the center undergoing substitution
B) slightly more inversion than retention at the center undergoing substitution
C) slightly more retention then inversion at the center undergoing substitution
D) complete inversion at the center undergoing substitution
E) complete retention at the center undergoing substitution
Answer: B
Diff: 3
Section: 6.14
LO: 6.3
MCAT LO: MCAT6.2
87) Provide two circumstances under which solvolysis of a chiral alkyl halide would not result in
the generation of a mixture of enantiomeric products.
Answer: Choose two from among:
(i) leaving group not bound to stereocenter
(ii) rearrangement yields a carbocation in which two groups bound to the cationic center are the
same
(iii) the molecule contains at least one additional stereocenter which is unaffected by the
ionization
(iv) rearrangement ultimately results in a meso compound
Diff: 3
Section: 6.14
LO: 6.4
A) 1
B) 3
C) 1, 2, & 3
D) 2 & 3
Answer: B
Diff: 2
Section: 6.15
LO: 6.5
26
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89) Which of the following alkyl halides is most likely to undergo rearrangement in an SN1
reaction?
A) 3-bromopentane
B) 2-chloro-3,3-dimethylpentane
C) 3-chloropentane
D) bromocyclohexane
E) 1-bromo-4-methylcyclohexane
Answer: B
Diff: 2
Section: 6.15
LO: 6.5
90) Which of the following alkyl chlorides is least likely to undergo rearrangement during a
solvolysis reaction?
A) 2-chloro-4-methylpentane
B) 2-chloro-3-methylpentane
C) 2-chloro-2-methylpentane
D) cis-1-chloro-2-ethylcyclohexane
E) trans-1-chloro-2-ethylcyclohexane
Answer: C
Diff: 2
Section: 6.15
LO: 6.5
27
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91) A sample of 1-chloro-1-phenylethane with an [α]25D of -94.8° is reacted with NH3 in
methanol/water solvent. The major substitution product of the reaction is 1-phenyl-1-ethylamine
with an [α]25D of -8.6°. Given that optically pure (R) 1-chloro-1-phenylethane has a specific
rotation of -109.0° and that optically pure (R) 1-phenyl-1-ethylamine has a specific rotation of
+39.3°, which of the following statements best describes this reaction?
92) Predict the structure of the expected product for the following reaction.
Answer:
Diff: 3
Section: 6.15
LO: 6.3, 6.5
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93) Provide the major organic product of the reaction below and a detailed, stepwise mechanism
which accounts for its formation.
Answer:
Diff: 3
Section: 6.15
LO: 6.3, 6.5
94) Provide the structure of the major organic product which results in the following reaction.
Answer:
Diff: 3
Section: 6.15
LO: 6.3, 6.5
MCAT LO: MCAT6.2
29
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95) Which of the following statements correctly describe(s) E1 reactions of alkyl halides (RX)?
I. Rate = k[base]
II. Rate = k[base][RX]
III. Rate = k[RX]
IV. The reactions occur in two or more distinct steps.
V. Rearrangements are sometimes seen.
A) II and IV
B) III and V
C) I, IV, and V
D) I only
E) III, IV, and V
Answer: E
Diff: 2
Section: 7.10
LO: 6.3
MCAT LO: MCAT6.3
96) Why does CH2 CHCHBrCH3 undergo solvolysis much more rapidly than 2-bromobutane?
Answer: The intermediate carbocation is resonance stabilized.
Diff: 3
Section: 6.13
LO: 6.6
MCAT LO: MCAT6.5
30
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97) When 1-bromo-2, 2-dimethylcyclopentane is heated in ethanol, one of the products which
results is shown below. Provide a detailed, stepwise mechanism for the production of this
compound, and give the name of the mechanism by which it is produced.
Answer:
Diff: 3
Section: 7.10
LO: 6.4
GO: G2
98) Provide a step-by-step mechanism for the reaction below. Include all intermediates, formal
charges and correct arrow pushing of electrons.
Answer:
Diff: 3
Section: 7.10
LO: 6.4
GO: G2
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99) What is Zaitsev's rule?
Answer: In elimination reactions, the most highly substituted alkene product is the major
product.
Diff: 2
Section: 7.11
LO: 6.2
100) Dehydration of 1-butanol with concentrated sulfuric acid at 140∘C results in the formation
of mainly trans-2-butene. According to these results, which of the following conclusions might
be valid?
A) The reaction undergoes an E2-type elimination mechanism.
B) The reaction follows a new mechanism involving the formation of a carbanion intermediate.
C) The reaction undergoes an E1-type elimination mechanism in conjunction with a hydride
shift.
D) The reaction undergoes an E2-type elimination mechanism in conjunction with a methyl shift.
E) The reaction undergoes an E1-type elimination mechanism with no shifting.
Answer: C
Diff: 3
Section: 7.11
LO: 7.4
GO: G7
MCAT LO: MCAT6.2
101) How many distinct alkene products are possible, including stereoisomers, when the alkyl
iodide below undergoes E2 elimination?
A) 1
B) 2
C) 3
D) 4
E) 5
Answer: E
Diff: 2
Section: 7.12
LO: 7.6
MCAT LO: MCAT6.2
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102) Which of the following alkyl halides can produce only a single alkene product from when
treated with sodium methoxide?
A) 2-chloro-2-methylpentane
B) 3-chloro-3-ethylpentane
C) 3-chloro-2-methylpentane
D) 2-chloro-4-methylpentane
E) 2-chloro-3-ethylpentane
Answer: B
Diff: 2
Section: 7.12
LO: 7.6
GO: G2
MCAT LO: MCAT6.2
103) How many distinct alkene products results when 1-bromo-1-ethylcyclopentane is treated
with NaOCH3?
A) 1
B) 2
C) 3
D) 4
Answer: B
Diff: 2
Section: 7.12
LO: 7.4
MCAT LO: MCAT6.2
Answer:
Diff: 2
Section: 7.12
LO: 7.4
MCAT LO: MCAT6.2
33
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105) Provide the major organic product of the reaction below.
Answer:
Diff: 2
Section: 7.12
LO: 7.4
MCAT LO: MCAT6.2
Answer:
Diff: 2
Section: 7.12
LO: 7.4
MCAT LO: MCAT6.2
34
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107) Provide a structure for the major substitution and major elimination product resulting from
the reaction below.
Answer:
Diff: 2
Section: 7.17
LO: 7.4
MCAT LO: MCAT6.2
108) Provide the structure of the major alkene product of the reaction below.
Answer:
Diff: 2
Section: 6.19
LO: 7.4
MCAT LO: MCAT6.2
Answer:
Diff: 2
Section: 7.12
LO: 7.4
MCAT LO: MCAT6.2
35
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110) Provide a series of synthetic steps by which (CH3)2C CH2 could be prepared from 2-
methylpropane.
Answer: 1) Br2, hν
2) NaOCH3, CH3OH
Diff: 2
Section: 7.12
LO: 7.7
GO: G7
111) Provide the structure of the major organic product which results when 2-bromo-2-
methylbutane is treated with sodium ethoxide.
Answer:
Diff: 2
Section: 7.12
LO: 7.4
GO: G7
MCAT LO: MCAT6.2
36
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113) Provide the major organic product of the reaction below.
Answer:
Diff: 2
Section: 7.14
LO: 7.6
GO: G2
MCAT LO: MCAT6.2
114) Provide the structure of the major organic product which results in the following reaction.
Answer:
Diff: 2
Section: 7.15
LO: 7.6
MCAT LO: MCAT6.2
37
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115) Provide the structure of the major organic product which results in the following reaction.
Answer:
Diff: 2
Section: 7.15
LO: 7.6
MCAT LO: MCAT6.2
116) Propose a mechanism with a hydride shift for the solvolysis reaction below.
Answer:
Diff: 3
Section: 6.15
LO: 6.4
GO: G2
38
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117) Provide a structure for the major substitution and elimination product of the following
reaction.
Answer:
Diff: 3
Section: 7.17
LO: 7.6
GO: G2
MCAT LO: MCAT6.2
118) When (cis)-1-bromo-2 methylcyclohexane is treated with methanol and heat, four different
products are formed — two by substitution and two by elimination.
Which of the following conditions would change the outcome of this reaction by promoting the
production of 3-methylhexene as the major product?
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119) Draw a chair conformation of the starting substituted cyclohexane molecule with the
bromine in the axial position. Using this model, predict the major elimination product of this
reaction.
Answer:
Diff: 3
Section: 7.15
LO: 7.6
GO: G7
MCAT LO: MCAT6.2
121) Provide the structure of the major organic product in the following reaction.
Answer:
Diff: 3
Section: 7.14
LO: 7.6
GO: G2
MCAT LO: MCAT6.2
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122) Provide the structure of the major organic product in the following reaction.
Answer:
Diff: 3
Section: 7.14
LO: 7.6
GO: G2
MCAT LO: MCAT6.2
123) Which of the following mechanisms (SN1, SN2, E1, E2) feature(s) a carbocation
intermediate?
A) SN1 only
B) SN2 only
C) E1 only
D) E2 only
E) both SN1 and E1
Answer: E
Diff: 1
Section: 7.17
LO: 6.9
GO: G2
MCAT LO: MCAT6.2
124) In which of the following mechanisms (SN1, SN2, E1, E2) are alkenes the major reaction
products?
A) SN1 only
B) SN2 only
C) E1 only
D) E2 only
E) both E1 and E2
Answer: E
Diff: 1
Section: 7.17
LO: 6.9
GO: G2
MCAT LO: MCAT6.2
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125) Predict the most likely mechanism for the reaction shown below.
A) SN1
B) SN2
C) E1
D) E2
E) E1cb
Answer: A
Diff: 2
Section: 7.17
LO: 6.9
GO: G7
MCAT LO: MCAT6.2
126) Predict the most likely mechanism for the reaction shown below.
A) SN1
B) SN2
C) E1
D) E2
E) E1cb
Answer: D
Diff: 2
Section: 7.17
LO: 6.9
GO: G7
MCAT LO: MCAT6.2
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127) Predict the two most likely mechanisms for the reaction of 2-iodohexane with potassium
hydroxide.
A) SN1 and SN2
B) E1 and E2
C) SN2 and E2
D) E1 and SN1
Answer: C
Diff: 1
Section: 7.17
LO: 6.9
GO: G7
MCAT LO: MCAT6.2
128) Predict the two most likely mechanisms that occur when iodocyclohexane is heated in
methanol.
A) SN1 and SN2
B) E1 and E2
C) SN2 and E2
D) E1 and SN1
Answer: D
Diff: 1
Section: 7.17
LO: 6.9
GO: G7
MCAT LO: MCAT6.2
129) The major product from the reaction of 2-chloro-2-methylpentane with sodium ethoxide in
ethanol results from which of the following mechanistic pathways?
A) SN1
B) SN2
C) E1
D) E2
E) Ecb
Answer: D
Diff: 1
Section: 7.17
LO: 6.9
GO: G7
MCAT LO: MCAT6.2
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130) One product which results when 2-chloro-2-methylpentane is heated in ethanol is an ether.
From which mechanistic pathway does this ether arise?
A) SN1
B) SN2
C) E1
D) E2
E) E1cb
Answer: A
Diff: 2
Section: 7.17
LO: 6.9
GO: G7
MCAT LO: MCAT6.2
131) When 3-iodo-3-ethylpentane is treated with sodium methoxide in methanol, the major
organic product is an ________ that is generated through an ________ mechanism.
A) ether; SN1
B) ether; SN2
C) ether; E1
D) alkene; E2
E) alkene; E1
Answer: D
Diff: 2
Section: 7.17
LO: 6.9
GO: G7
MCAT LO: MCAT6.2
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133) Which of the following carbocations is likely to undergo a hydride shift?
A) I
B) II
C) III
D) IV
E) II and IV
F) II and III
Answer: E
Diff: 1
Section: 6.15
LO: 6.5
GO: G2
Answer:
Diff: 1
Section: 6.10
GO: G2
Answer:
Diff: 1
Section: 6.10
GO: G2
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136) Rank the following compounds in order of increasing reactivity in an SN2 reaction. (Fastest
is first, slowest is last.)
137) Consider the substitution reaction shown below. By what mechanism will the reaction
proceed?
A) SN1
B) SN2
C) Free radical reaction
D) There is not enough information to tell.
Answer: A
Diff: 1
Section: 6.16
LO: 6.7
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138) Consider the substitution reaction shown below. By what mechanism will the reaction
proceed?
A) SN1
B) SN2
C) Free radical reaction
D) There is not enough information to tell.
Answer: B
Diff: 2
Section: 6.16
LO: 6.7
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