Buy Isomers and Physical Properties

Buy Isomers and Physical Properties
Buy Isomers and Physical Properties
1. Resonance stabilizes many compounds. The following is an example
of resonance.
C
O
R X
C
O
R X


Which of these compounds would benefit the most from this type
of resonance?
(A) Amide
(B) Ester
(C) Carboxylic acid
(D) Acid chloride
62. Which of the following is (1R,3S)-1,3-dibromo-1,3-difluorobutane?
(A) C C
CH2 CH3
Br
Br F
F
H
(B) C C
CH2 CH3
F Br
Br F
H
(C) C C
CH2 CH3
F Br
Br F
H
(D) C C
CH2 CH3
Br Br
F F
H
Isomers and Physical Properties  27
63. What is the relationship between the following two compounds?
H
H
HO
H
H
OH
H
H
H
OH
H
HO
(A) Identical
(B) Enantiomers
(C) Diastereomers
(D) Conformers
64. Which of the following compounds is NOT polar?
(A)
H
F
F
F
(B)
H
F
H
F
(C)
H
H
F
F
(D)
H
F
F
H
65. Why is the melting point of ethyl methyl amine higher than that of
trimethyl amine?
(A) Ethyl methyl amine has intermolecular hydrogen bonding.
(B) Ethyl methyl amine does not have intermolecular hydrogen bonding.
(C) Ethyl methyl amine has a higher molar mass.
(D) Trimethyl amine has a higher molar mass.
28 › McGraw-Hill Education 500 MCAT: Organic Chemistry
66. What is the stereochemistry of the following cyclopropane?
CH2Cl
CH(CH3)2
(A) 1S, 2R
(B) 2R, 3S
(C) 1S, 2S
(D) 2S, 3S
67. The last step in the synthesis of a new experimental drug involves the
reaction of two optically active species. Even though each species contains
only one chiral center, both species are available only as part of a racemic
mixture. What is the maximum number of stereoisomers that the chemists
will need to separate?
(A) 6
(B) 2
(C) 4
(D) 8
68. The S stereoisomer of a compound reacts with a racemic mixture of
another compound. This results in two compounds that are easily
separated from the reaction mixture. These two compounds are:
(A) Tautomers.
(B) Enantiomers.
(C) Conformers.
(D) Diastereomers.
69. Which of the following compounds have a nonzero net dipole moment?
CCC Cl
Cl
Cl
Cl Cl
H
H
Cl
H
O
H
H
H
I II III
(A) I only
(B) III only
(C) II and III
(D) I and III
Isomers and Physical Properties  29
70. Arrange the following compounds in order of increasing dipole moment.
O
OH
I II III
O
(A) I < II < III
(B) III < II < I
(C) I < III < II
(D) III < I < II
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