Question 1

Rank the conformers of butane in order of decreasing stability,putting the most stable first.  I > II > III B) IV > I > III > II C) II > III > I > IV D) I > IV > II > III" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

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

Question 2

Which of the following cycloalkanes has the most angle strain?

Accepted Answer

A)  Cyclopropane
B)  Cyclobutane
C)  Cyclopentane
D)  Cyclohexane

Question 3

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.

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)  IV

Question 5

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.

Question 6

Which of the following cycloalkanes has the least angle strain?

Accepted Answer

A)  Cyclopropane
B)  Cyclohexane
C)  Cyclopentane
D)  Cycloheptane

Question 7

Rank the following alkanes in order of increasing melting point,putting the alkane with the lowest melting point first.

Accepted Answer

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

Question 8

How many cycloalkane constitutional isomers (excluding stereoisomers) are there with molecular formula C5H10?

Accepted Answer

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

Question 9

Which formula represents a cycloalkane with 5 carbons?

Accepted Answer

A)  C5H8
B)  C5H10
C)  C5H12
D)  C5H14

Question 10

What are the products of the combustion of alkanes?

Accepted Answer

A)  Carbon and hydrogen
B)  Carbon and water
C)  Carbon dioxide and hydrogen
D)  Carbon dioxide and water

Question 11

Which of the following is not another representation for 2-methylbutane?

Accepted Answer

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

Question 12

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-propylheptane

Question 13

What is the IUPAC name for the following compound?

Accepted Answer

A)  Hexylcyclopentane
B)  1-Hexylcyclopentane
C)  1-Cyclopentylhexane
D)  1-Cyclopentylheptane

Question 14

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 these

Question 15

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.

Question 16

Which of the following is the highest energy conformer of 2,3-dimethylbutane?

Accepted Answer

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

Question 17

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

Accepted Answer

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

Question 18

What is the common name of the following alkyl group?

Accepted Answer

A)  Isobutyl
B)  sec-Butyl
C)  Isopropyl
D)  tert-Butyl

Question 19

Which of the following conformers has the highest energy?

Accepted Answer

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

Question 20

Which of the following is the most stable conformation of the following compound?

Accepted Answer

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

Exam 4: Alkanes

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

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Which of the following statements about alkanes is not true?

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Which of the following is the highest energy conformer of 2,3-dimethylbutane?

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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 is the most stable conformation of the following compound?

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What are the products of the combustion of alkanes?

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How many cycloalkane constitutional isomers (excluding stereoisomers) are there with molecular formula C5H10?

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Rank the following alkanes in order of increasing melting point,putting the alkane with the lowest melting point first.

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

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Rank the conformers of butane in order of decreasing stability,putting the most stable first.

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Which of the following is not another representation for 2-methylbutane?

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What is the common name of the following alkyl group?

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

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What is the IUPAC name for the following compound?

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Which of the following conformers has the highest energy?

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Which of the following cycloalkanes has the least angle strain?

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Which formula represents a cycloalkane with 5 carbons?

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What is the IUPAC name for the following compound?

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How many cycloalkane constitutional isomers (excluding stereoisomers) are there with molecular formula C₅H₁₀?

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