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Which is the structure for trans-1-ethyl-3-isopropylcyclohexane? Which is the structure for trans-1-ethyl-3-isopropylcyclohexane? A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

E) B) and D)
F) C) and D)

Correct Answer

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Which cycloalkanes can exist as either cis- or trans-isomers? Which cycloalkanes can exist as either cis- or trans-isomers? A) I, V B) I, II, V C) II, III, V D) II, III, IV


A) I, V
B) I, II, V
C) II, III, V
D) II, III, IV

E) B) and C)
F) All of the above

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Which conformation of pentane is most stable? Which conformation of pentane is most stable? A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

E) A) and B)
F) A) and C)

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Pentane and cyclopentane are constitutional isomers.

A) True
B) False

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How many primary carbons are there in the following alkane? How many primary carbons are there in the following alkane? A) 1 B) 2 C) 4 D) 6


A) 1
B) 2
C) 4
D) 6

E) All of the above
F) A) and C)

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How many primary carbons are in cholesterol? How many primary carbons are in cholesterol? A) 2 B) 3 C) 4 D) 5


A) 2
B) 3
C) 4
D) 5

E) A) and B)
F) A) and C)

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The following structures represent the same molecule. The following structures represent the same molecule.

A) True
B) False

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Complete the following reaction by writing the stoichiometric coefficients. Complete the following reaction by writing the stoichiometric coefficients.

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How many secondary hydrogens are there in the following alkane? How many secondary hydrogens are there in the following alkane? A) 1 B) 2 C) 4 D) 9


A) 1
B) 2
C) 4
D) 9

E) A) and B)
F) None of the above

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Draw a constitutional isomer of propanone (C3H6O). Draw a constitutional isomer of propanone (C<sub>3</sub>H<sub>6</sub>O).

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Which of the following properties are not identical for constitutional isomers? I. molecular formula II. molecular weight III. order of attachment of atoms IV. physical properties


A) I, IV
B) II, III
C) I, II
D) III, IV

E) C) and D)
F) B) and C)

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Which conformation of 2-methylbutane is the most stable?Hint: Build a molecular model! Which conformation of 2-methylbutane is the most stable?Hint: Build a molecular model! A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

E) A) and B)
F) None of the above

Correct Answer

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Which of the following molecules are constitutional isomers? Which of the following molecules are constitutional isomers? A) I and IV B) II and III C) I , II, and IV D) I, II, and III


A) I and IV
B) II and III
C) I , II, and IV
D) I, II, and III

E) B) and D)
F) B) and C)

Correct Answer

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Which conformation of 2-methylbutane is least stable? Which conformation of 2-methylbutane is least stable? A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

E) A) and C)
F) B) and D)

Correct Answer

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In the most stable conformation of trans-1,4-dimethylcyclohexane, what positions do the methyl groups occupy?


A) axial, axial
B) equatorial, axial
C) equatorial, equatorial
D) axial, equatorial

E) All of the above
F) C) and D)

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What is the classification of the indicated carbon? What is the classification of the indicated carbon?

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The Newman projection below shows pentane in a gauche conformation. The Newman projection below shows pentane in a gauche conformation.

A) True
B) False

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Complete the Newman projection for the least stable conformation of 2-methylbutane. Use the appropriate Newman projection template. Complete the Newman projection for the least stable conformation of 2-methylbutane. Use the appropriate Newman projection template.

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Which is the IUPAC name for the following cycloalkane? Which is the IUPAC name for the following cycloalkane? A) 2,4-dimethyl-1-ethylcyclopentane B) 1,3-dimethyl-5-ethylcyclopentane C) 1-ethyl-2,4-dimethylcyclopentane D) 1-ethyl-3,5-dimethylcyclopentane


A) 2,4-dimethyl-1-ethylcyclopentane
B) 1,3-dimethyl-5-ethylcyclopentane
C) 1-ethyl-2,4-dimethylcyclopentane
D) 1-ethyl-3,5-dimethylcyclopentane

E) B) and C)
F) C) and D)

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Complete the Newman projection for the most stable conformation of 2-methylbutane. Use the appropriate Newman projection template. Complete the Newman projection for the most stable conformation of 2-methylbutane. Use the appropriate Newman projection template.

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