Question 1

How many constitutional isomers are there with the molecular formula C5H12?

Accepted Answer

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

Question 2

Which of the following compounds has only 1 ∘\circ∘  and 3 ∘\circ∘ carbon atoms?

Accepted Answer

A)  hexane
B)  2-methylpentane
C)  3-methylpentane
D)  2,3-dimethylbutane

Question 3

Match the Newman projection for the conformation of 2-methylbutane to the indicated position on the potential energy diagram.  A) B) C) 
D)
-Conformation B is represented by Roman numeral ____.

Accepted Answer

The answer of Match the Newman projection for the conformation...

Question 4

What is the approximate dihedral angle between the two chlorine atoms in the diequatorial conformation of trans-1,2-dichlorocyclohexane?

Accepted Answer

A)  0 ∘\circ∘ 
B)  60 ∘\circ∘ 
C)  120 ∘\circ∘ 
D)  180 ∘\circ∘

Question 5

What is the approximate dihedral angle between the two chlorine atoms in the diaxial conformation of trans-1,2-dichlorocyclohexane?

Accepted Answer

A)  0 ∘\circ∘ 
B)  60 ∘\circ∘ 
C)  120 ∘\circ∘ 
D)  180 ∘\circ∘

Question 6

Which of the following compounds can adopt a chair conformation in which there are no axial methyl groups?

Accepted Answer

A)  cis-1,2-dimethylcyclohexane
B)  cis-1,3-dimethylcyclohexane
C)  trans-1,3-dimethylcyclohexane
D)  cis-1,4-dimethylcyclohexane

Question 7

Which of the following substituted cyclohexanes has the most negative value of  Δ\DeltaΔ G ∘\circ∘  for ring flipping from the conformation in which the substituent is axial to the one where it is equatorial?

Accepted Answer

A)  methylcyclohexane
B)  chlorocyclohexane
C)  isopropylcyclohexane
D)  ethynylcyclohexane

Question 8

What is the approximate C-C-C bond angle in propane?

Accepted Answer

A)  90 ∘\circ∘ 
B)  109 ∘\circ∘ 
C)  120 ∘\circ∘ 
D)  180 ∘\circ∘

Question 9

What is the IUPAC name of the following compound?

Accepted Answer

A)  2,4-dimethyl-3-isopropyl-pentane
B)  3-isopropyl-1,5-dimethylpentane
C)  3-isopropyl-2,4-dimethylpentane
D)  triisopropylmethane

Question 10

What is the correct assignment of common names for the following molecules?

Accepted Answer

A)  i = pentane; ii = isopentane; iii = neopentane
B)  i = neopentane; ii = isopentane; iii = pentane
C)  i = pentane; ii = neopentane; iii = isopentane
D)  i = neopentane; ii = pentane; iii = isopentane

Question 11

What is the IUPAC name of the following compound?

Accepted Answer

A)  5,5-dimethyl-3-ethylheptane
B)  5-ethyl-3,3-dimethyl-heptane
C)  3,3-dimethyl-5-ethylheptane
D)  3-ethyl-5,5-dimethyl-heptane

Question 12

What is the correct assignment of common names for the following molecules?

Accepted Answer

A)  i = butane; ii = neopentane; iii = isopentane
B)  i = neobutane; ii = isobutane; iii = pentane
C)  i = butane; ii = isobutane; iii = isopentane
D)  i = butane; ii = isobutane; iii = neopentane

Question 13

Provide a line-bond structure of pentanal.

Accepted Answer

The answer of Provide a line-bond structure of pentanal....

Question 14

Which of the following statements is not true?

Accepted Answer

A)  Combustion of an alkane is an exothermic reaction.
B)  The heat of combustion of propane is three times that of methane.
C)  The constitutional isomers of C7H16 have different heats of combustion from one another
D)  The products of combustion of an alkane are H2O and CO2.

Question 15

How many hydrogen atoms are there in octane?

Accepted Answer

The answer of How many hydrogen atoms are there in...

Question 16

What is the IUPAC name of the following compound?

Accepted Answer

The answer of What is the IUPAC name of the...

Question 17

Which of the following Newman projections does not represent 2-methylhexane?

Accepted Answer

A)  1
B)  2
C)  3
D)  4

Question 18

What is the IUPAC name of the following compound?

Accepted Answer

A)  bicyclo[4.3]nonane
B)  bicyclo[4.3.0]nonane
C)  bicyclo[6.5]nonane
D)  bicyclo[6.5.0]nonane

Question 19

Match the Newman projection for the conformation of 2-methylbutane to the indicated position on the potential energy diagram.  A) B) C) 
D)
-Conformation C is represented by Roman numeral ____.

Accepted Answer

The answer of Match the Newman projection for the conformation...

Question 20

Which of the following structures is different from the other three?

Accepted Answer

A)  1
B)  2
C)  3
D)  4

Exam 2: Alkanes and Cycloalkanes

Match the Newman projection for the conformation of 2-methylbutane to the indicated position on the potential energy diagram. A) B) C) D) -Conformation B is represented by Roman numeral ____.

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What is the correct assignment of common names for the following molecules?

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Which of the following compounds can adopt a chair conformation in which there are no axial methyl groups?

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How many constitutional isomers are there with the molecular formula C5H12?

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Which of the following compounds has only 1 ∘\circ∘ and 3 ∘\circ∘ carbon atoms?

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Match the Newman projection for the conformation of 2-methylbutane to the indicated position on the potential energy diagram. A) B) C) D) -Conformation C is represented by Roman numeral ____.

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Which of the following structures is different from the other three?

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What is the approximate dihedral angle between the two chlorine atoms in the diaxial conformation of trans-1,2-dichlorocyclohexane?

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What is the approximate dihedral angle between the two chlorine atoms in the diequatorial conformation of trans-1,2-dichlorocyclohexane?

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What is the correct assignment of common names for the following molecules?

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What is the IUPAC name of the following compound?

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What is the approximate C-C-C bond angle in propane?

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Which of the following statements is not true?

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Which of the following Newman projections does not represent 2-methylhexane?

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How many hydrogen atoms are there in octane?

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Provide a line-bond structure of pentanal.

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What is the IUPAC name of the following compound?

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What is the IUPAC name of the following compound?

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Which of the following substituted cyclohexanes has the most negative value of Δ\DeltaΔ G ∘\circ∘ for ring flipping from the conformation in which the substituent is axial to the one where it is equatorial?

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What is the IUPAC name of the following compound?

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How many constitutional isomers are there with the molecular formula C₅H₁₂?

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Which of the following compounds has only 1^$\circ$ and 3^$\circ$carbon atoms?

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Which of the following substituted cyclohexanes has the most negative value of $\Delta$ G^$\circ$ for ring flipping from the conformation in which the substituent is axial to the one where it is equatorial?

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