Question 1

Which of the following cycloalkanes has the most angle strain?

Accepted Answer

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

Question 2

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 s 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) All of the above
F) None of the above

Question 3

What is the IUPAC name for the following compound?

Accepted Answer

A)  3-Ethyl-2,7-dimethyl-5-sec-butyldecane
B)  5-sec-Butyl-3-ethyl-2,7-dimethyldecane
C)  2,7-Dimethyl-3-ethyl-5-sec-butyldecane
D)  3-Ethyl-2,7-dimethyl-5-isobutyldecaneE) C) and D)
F) A) and B)

Question 4

Which of the following is not a conformer of butane?

Accepted Answer

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

Question 5

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) B) and D)
F) All of the above

Question 6

What is the IUPAC name for the following compound?

Accepted Answer

A)  3-Ethyl-1-methylcyclohexane
B)  1-Ethyl-3-methylcyclohexane
C)  1-Ethyl-3-methylhexane
D)  3-Ethyl-1-methylhexaneE) All of the above
F) B) and C)

Question 7

What is the IUPAC name for the following compound?

Accepted Answer

A)  Hexylcyclopentane
B)  1-Hexylcyclopentane
C)  1-Cyclopentylhexane
D)  1-CyclopentylheptaneE) A) and C)
F) B) and C)

Question 8

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) None of the above
F) A) and D)

Question 9

What is the name of the alkyl group that contains two carbons in a straight chain and one-carbon branch?

Accepted Answer

A)  Ethyl
B)  Propyl
C)  Isopropyl
D)  None of theseE) None of the above
F) A) and C)

Question 10

What is the hybridization of a carbon atom in an alkane?

Accepted Answer

A)  sp3
B)  sp2
C)  sp
D)  pE) All of the above
F) A) and C)

Question 11

Which of the following is the most stable conformation of cis-1-ethyl-3-isopropylcyclohexane?

Accepted Answer

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

Question 12

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

Accepted Answer

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

Question 13

What is the relation between the following pair of compounds?

Accepted Answer

A)  Constitutional isomers
B)  Stereoisomers
C)  Identical molecules
D)  Not isomers of each otherE) A) and C)
F) All of the above

Question 14

What is the IUPAC name for the following compound?

Accepted Answer

A)  5-Ethyl-3,6-dimethylheptane
B)  3-Ethyl-2,5-dimethylheptane
C)  3-Ethyl-2,5-dimethyloctane
D)  5-Ethyl-3,6-dimethyloctaneE) A) and B)
F) None of the above

Question 15

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

Question 16

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

Accepted Answer

A)  Conformations are the same arrangements of atoms that cannot be interconverted by rotation about single bonds.
B)  In the eclipsed conformation, the C-H bonds on one carbon bisect the H-C-H bond angle on the adjacent carbon.
C)  In the staggered conformation, the C-H bonds on one carbon are directly aligned with the C-H bonds on the adjacent carbon.
D)  Rotating the atoms on one carbon by 60° converts an eclipsed conformation into a staggered conformation, and vice versa.E) B) and C)
F) A) and B) D

Question 17

What is the common name of the following alkyl group?

Accepted Answer

A)  Isobutyl
B)  sec-Butyl
C)  Isopropyl
D)  tert-ButylE) B) and C)
F) All of the above

Question 18

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 B)

Question 19

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

Accepted Answer

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

Question 20

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

Accepted Answer

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

Exam 4: Alkanes

Which of the following cycloalkanes has the most angle strain?

Correct AnswerverifiedA

Which of the following statements about alkanes is not true?

Correct AnswerverifiedShow Answer

What is the IUPAC name for the following compound?

Correct AnswerverifiedShow Answer

Which of the following is not a conformer of butane?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the IUPAC name for the following compound?

Correct AnswerverifiedShow Answer

What is the IUPAC name for the following compound?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the name of the alkyl group that contains two carbons in a straight chain and one-carbon branch?

Correct AnswerverifiedShow Answer

What is the hybridization of a carbon atom in an alkane?

Correct AnswerverifiedShow Answer

Which of the following is the most stable conformation of cis-1-ethyl-3-isopropylcyclohexane?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the relation between the following pair of compounds?

Correct AnswerverifiedShow Answer

What is the IUPAC name for the following compound?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

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

Correct AnswerverifiedD

What is the common name of the following alkyl group?

Correct AnswerverifiedShow Answer

What is the parent chain for the following compound?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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A

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D

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D

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

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