Question 1

Which of the following compounds has only primary and secondary hydrogen atoms?

Accepted Answer

A)   2-Methylpentane
B)   2,2,3-Trimethylpentane
C)   3-Methylpentane
D)   2,2-DimethylpentaneE) A) and B)
F) B) and D)

Question 2

What is the molecular formula of an alkane that has twenty-three carbon atoms?

Accepted Answer

A)   C23H46
B)   C23H48
C)   C23H50
D)   C23H44E) A) and D)
F) All of the above

Question 3

Which of the following cycloalkanes has the most angle strain?

Accepted Answer

A)   Cyclopropane
B)   Cyclobutane
C)   Cyclopentane
D)   CyclohexaneE) A) and C)
F) A) and B) A

Question 4

Which of the following is the most stable conformation of trans-1-isopropyl-3-methylcyclohexane?

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) None of the above
F) A) and D)

Question 5

What is the IUPAC name for the following compound?

Accepted Answer

A)   2,3,5-Trimethylhexane
B)   2,4,5-Triethylhexane
C)   2,4-Diethyl-5-methylheptane
D)   4-Ethyl-3,6-dimethyloctaneE) B) and C)
F) A) and C)

Question 6

What is the IUPAC name for the following compound?

Accepted Answer

A)   2,3-Dimethyl-4-sec-butylheptane
B)   4-sec-Butyl-2,3-dimethylheptane
C)   3,5,6-Trimethyl-4-propylheptane
D)   2,3,5-Trimethyl-4-propylheptaneE) None of the above
F) C) and D)

Question 7

Which of the following is the lowest energy conformer of 2,3-dimethybutane?

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) B) and D)
F) B) and C)

Question 8

What is the parent chain for the following compound?

Accepted Answer

A)   Hexane
B)   Heptane
C)   Octane
D)   NonaneE) All of the above
F) A) and D)

Question 9

Which of the following compounds has primary, secondary and tertiary hydrogen atoms?

Accepted Answer

A)   Pentane
B)   Hexane
C)   2-Methylpentane
D)   2,2-DimethylpentaneE) A) and B)
F) None of the above

Question 10

Which of the following statements about alkanes is true?

Accepted Answer

A)   Alkanes are aliphatic hydrocarbons having only C-C and C-H  bonds.
B)   Cyclic alkanes have two fewer H atoms than acyclic alkanes with the same number of carbons.
C)   Acyclic alkanes contain carbons joined in one or more rings.
D)   Acyclic alkanes have general molecular formula CnH2n.E) A) and D)
F) C) and D)

Question 11

Which of the following compounds has only primary and secondary carbon atoms?

Accepted Answer

A)   Pentane
B)   2-Methylpentane
C)   2,2-Dimethylpentane
D)   2,3,3-TrimethylpentaneE) A) and C)
F) A) and D) A

Question 12

What is the IUPAC name for the following compound?

Accepted Answer

A)   1-sec-Butyl-4-isopropyl-2-methylcyclohexane
B)   1-Isopropyl-3-methyl-4-sec-butylcyclohexane
C)   4-Isopropyl-2-methyl-1-sec-butylcyclohexane
D)   1-sec-Butyl-3-isopropyl-2-methylcyclohexaneE) B) and D)
F) All of the above

Question 13

How many constitutional isomers are there with the molecular formula C6H14?

Accepted Answer

A)   2
B)   3
C)   4
D)   5E) B) and C)
F) A) and D)

Question 14

Which of the following are gauche conformers?

Accepted Answer

A)   I and II
B)   I and III
C)   II and IV
D)   II and IIIE) B) and C)
F) All of the above

Question 15

Which of the following is not a conformer of butane?

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) All of the above
F) None of the above

Question 16

Which of the following chair conformations represents trans-1,3-dimethylcyclohexane?

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) C) and D)
F) A) and B)

Question 17

What is the IUPAC name for the following compound?

Accepted Answer

A)   1,4-Dimethylcyclohexane
B)   1,3-Dimethylcyclohexane
C)   1,3-Dimethylcyclopentane
D)   1,4-DimethylcyclopentaneE) A) and B)
F) C) and D) C

Question 18

Which of the following statements about alkanes is not true?

Accepted Answer

A)   Alkanes are aliphatic hydrocarbons.
B)   Alkanes contain only C-C and C-H  bonds.
C)   Alkanes are acyclic or cyclic.
D)   Acyclic alkanes have two fewer H atoms than cyclic alkanes with the same number of carbons.E) A) and B)
F) None of the above

Question 19

Which of the following statements about the conformations of acyclic alkanes is not true?

Accepted Answer

A)   The staggered and eclipsed conformations are equally stable.
B)   The staggered conformations are more stable than the eclipsed conformations.
C)   An energy minimum and maximum occur every 60° as the conformation changes from staggered to eclipsed.
D)   Conformations that are neither staggered nor eclipsed are intermediate in energy.E) A) and B)
F) A) and C)

Question 20

Which of the following statements about the conformations of acyclic alkanes is true?

Accepted Answer

A)   A staggered conformation with two larger groups 180° from each other is called gauche.
B)   Staggered conformations are at energy maxima and eclipsed conformations are energy minima.
C)   A staggered conformation with two larger groups 60° from each other is called anti.
D)   Gauche conformations are generally higher in energy than anti conformations.E) A) and B)
F) None of the above

Exam 4: Alkanes

Which of the following compounds has only primary and secondary hydrogen atoms?

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What is the molecular formula of an alkane that has twenty-three carbon atoms?

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Which of the following cycloalkanes has the most angle strain?

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Which of the following is the most stable conformation of trans-1-isopropyl-3-methylcyclohexane?

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What is the IUPAC name for the following compound?

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What is the IUPAC name for the following compound?

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Which of the following is the lowest energy conformer of 2,3-dimethybutane?

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What is the parent chain for the following compound?

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Which of the following compounds has primary, secondary and tertiary hydrogen atoms?

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Which of the following statements about alkanes is true?

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Which of the following compounds has only primary and secondary carbon atoms?

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What is the IUPAC name for the following compound?

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How many constitutional isomers are there with the molecular formula C6H14?

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Which of the following are gauche conformers?

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Which of the following is not a conformer of butane?

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Which of the following chair conformations represents trans-1,3-dimethylcyclohexane?

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What is the IUPAC name for the following compound?

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Which of the following statements about alkanes is not true?

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Which of the following statements about the conformations of acyclic alkanes is not true?

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Which of the following statements about the conformations of acyclic alkanes is true?

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A

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A

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How many constitutional isomers are there with the molecular formula C₆H₁₄?

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C

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