Question 1

When deriving an IUPAC name, which of the following prefixes should be ignored during the alphabetizing of substituents?

Accepted Answer

A)  di- 
B)  sec- 
C)  tri- 
D)  all of these 
A)  di- 
B)  sec- 
C)  tri- 
D)  all of these

Question 2

How many different hydrocarbons are typically found a sample of unrefined petroleum?

Accepted Answer

A)  about 5 
B)  about 50 
C)  about 100 
D)  over a 1000 
A)  about 5 
B)  about 50 
C)  about 100 
D)  over a 1000

Question 3

Which of the following is true of pentane and 2-methylbutane?

Accepted Answer

A)  They have the same molecular formula. 
B)  They have the same boiling point. 
C)  Both a and b are true. 
D)  Neither a nor b is true. 
A)  They have the same molecular formula. 
B)  They have the same boiling point. 
C)  Both a and b are true. 
D)  Neither a nor b is true.

Question 4

Which of the following IUPAC names is incorrect?

Accepted Answer

A)  methylcyclohexane 
B)  cis-1,4-dimethylcyclohexane 
C)  cis-1,1,2-trimethylcyclohexane 
D)  none, they are all correct 
A)  methylcyclohexane 
B)  cis-1,4-dimethylcyclohexane 
C)  cis-1,1,2-trimethylcyclohexane 
D)  none, they are all correct

Question 5

The sec-butyl group is obtained by doing which of the following?

Accepted Answer

A)  removing a hydrogen atom from C-1 of butane 
B)  removing a hydrogen atom from C-2 of butane 
C)  removing a hydrogen atom from C-1 of 2-methylpropane 
D)  removing a hydrogen atom from C-2 of 2-methylpropane 
A)  removing a hydrogen atom from C-1 of butane 
B)  removing a hydrogen atom from C-2 of butane 
C)  removing a hydrogen atom from C-1 of 2-methylpropane 
D)  removing a hydrogen atom from C-2 of 2-methylpropane

Question 6

Unbranched hydrocarbons are also called straight chain hydrocarbons. Which of the following is true of unbranched hydrocarbons?

Accepted Answer

A)  The C−C−C angle is 180°. 
B)  No carbon atom is connected to more than two other carbon atoms. 
C)  both a and b 
D)  neither a nor b 
A)  The C−C−C angle is 180°. 
B)  No carbon atom is connected to more than two other carbon atoms. 
C)  both a and b 
D)  neither a nor b

Question 7

Unbranched hydrocarbons are also called straight chain hydrocarbons. Which of the following is true of unbranched hydrocarbons?

Accepted Answer

A)  Each carbon has bond angles of 120°. 
B)  Every carbon atom is connected to two other carbon atoms. 
C)  both a and b 
D)  neither a nor b 
A)  Each carbon has bond angles of 120°. 
B)  Every carbon atom is connected to two other carbon atoms. 
C)  both a and b 
D)  neither a nor b

Question 8

Which of the following statements is false?

Accepted Answer

A)  Petroleum was formed from the decomposition of marine plants and animals. 
B)  Petroleum is refined using fractional distillation. 
C)  Short chain hydrocarbons derived from petroleum are used for asphalt. 
D)  Diesel fuel is derived from a higher boiling fraction of petroleum than gasoline. 
A)  Petroleum was formed from the decomposition of marine plants and animals. 
B)  Petroleum is refined using fractional distillation. 
C)  Short chain hydrocarbons derived from petroleum are used for asphalt. 
D)  Diesel fuel is derived from a higher boiling fraction of petroleum than gasoline.

Question 9

Which of the following is the correct molecular formula for heptane?

Accepted Answer

A)  C5H12 
B)  C6H14 
C)  C7H16 
D)  C8H18 
A)  C5H12 
B)  C6H14 
C)  C7H16 
D)  C8H18

Question 10

The line-angle formula   represents which of the following alkanes?

Accepted Answer

A)  heptane 
B)  hexane 
C)  pentane 
D)  octane 
A)  heptane 
B)  hexane 
C)  pentane 
D)  octane

Question 11

How many different substituent groups can be obtained by removing a hydrogen atom from ethane?

Accepted Answer

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

Question 12

Which of the following is true about conformations of cycloalkanes?

Accepted Answer

A)  They are constitutional isomers of one another. 
B)  They are obtained from one another by rotation around carbon-carbon bonds. 
C)  They are obtained from one another by breaking and reforming carbon-carbon bonds. 
D)  They are equally stable. 
A)  They are constitutional isomers of one another. 
B)  They are obtained from one another by rotation around carbon-carbon bonds. 
C)  They are obtained from one another by breaking and reforming carbon-carbon bonds. 
D)  They are equally stable.

Question 13

Of the hydrocarbons given here, which contains the most carbon atoms?

Accepted Answer

A)  butane 
B)  pentane 
C)  ethane 
D)  propane 
A)  butane 
B)  pentane 
C)  ethane 
D)  propane

Question 14

What is the IUPAC name of the following compound?

Accepted Answer

A)  cis-1,5-diethylcyclopentane 
B)  trans-1,2-diethylcyclpentane 
C)  cis-1,2-diethylcyclopentane 
D)  trans-1,5-diethylcyclopentane 
A)  cis-1,5-diethylcyclopentane 
B)  trans-1,2-diethylcyclpentane 
C)  cis-1,2-diethylcyclopentane 
D)  trans-1,5-diethylcyclopentane

Question 15

Of the compounds listed here, which one is not a constitutional isomer of the other three?

Accepted Answer

A)  2,3-dimethylpentane 
B)  3-methylhexane 
C)  3-ethylpentane 
D)  2,2-dimethylbutane 
A)  2,3-dimethylpentane 
B)  3-methylhexane 
C)  3-ethylpentane 
D)  2,2-dimethylbutane

Question 16

Which of the following is true of the axial positions in cyclohexane?

Accepted Answer

A)  Each carbon atom of the ring has two groups bonded to it in axial positions. 
B)  Each carbon atom of the ring has one group bonded to it in an axial position. 
C)  The axial positions are all on the same side of the ring. 
D)  The axial and equatorial positions on each carbon atom are on the same side of the ring. 
A)  Each carbon atom of the ring has two groups bonded to it in axial positions. 
B)  Each carbon atom of the ring has one group bonded to it in an axial position. 
C)  The axial positions are all on the same side of the ring. 
D)  The axial and equatorial positions on each carbon atom are on the same side of the ring.

Question 17

Which of the following will not dissolve appreciably in hexane?

Accepted Answer

A)  decane 
B)  butane 
C)  water 
D)  methane 
A)  decane 
B)  butane 
C)  water 
D)  methane

Question 18

Which of the following is correct when constructing a line-angle formula for an alkane?

Accepted Answer

A)  Each line represents a carbon to carbon bond. 
B)  Each vertex represents a hydrogen atom. 
C)  A line ending is space represent a carbon atom to which two hydrogen atoms are attached. 
D)  All are correct in the construction of a line-angle formula. 
A)  Each line represents a carbon to carbon bond. 
B)  Each vertex represents a hydrogen atom. 
C)  A line ending is space represent a carbon atom to which two hydrogen atoms are attached. 
D)  All are correct in the construction of a line-angle formula.

Question 19

Which of the following straight chain alkanes is a solid at room temperature?

Accepted Answer

A)  C10H22 
B)  C6H14 
C)  C27H56 
D)  none of them 
A)  C10H22 
B)  C6H14 
C)  C27H56 
D)  none of them

Question 20

How many moles of molecular oxygen are consumed by the complete combustion of one mole of butane, C4H10?

Accepted Answer

A)  4 
B)  6.5 
C)  9 
D)  14 
A)  4 
B)  6.5 
C)  9 
D)  14

Exam 11: Alkanes

When deriving an IUPAC name, which of the following prefixes should be ignored during the alphabetizing of substituents?

How many different hydrocarbons are typically found a sample of unrefined petroleum?

Which of the following is true of pentane and 2-methylbutane?

Which of the following IUPAC names is incorrect?

The sec-butyl group is obtained by doing which of the following?

Unbranched hydrocarbons are also called straight chain hydrocarbons. Which of the following is true of unbranched hydrocarbons?

Unbranched hydrocarbons are also called straight chain hydrocarbons. Which of the following is true of unbranched hydrocarbons?

Which of the following statements is false?

Which of the following is the correct molecular formula for heptane?

The line-angle formula represents which of the following alkanes?

How many different substituent groups can be obtained by removing a hydrogen atom from ethane?

Which of the following is true about conformations of cycloalkanes?

Of the hydrocarbons given here, which contains the most carbon atoms?

What is the IUPAC name of the following compound?

Of the compounds listed here, which one is not a constitutional isomer of the other three?

Which of the following is true of the axial positions in cyclohexane?

Which of the following will not dissolve appreciably in hexane?

Which of the following is correct when constructing a line-angle formula for an alkane?

Which of the following straight chain alkanes is a solid at room temperature?

How many moles of molecular oxygen are consumed by the complete combustion of one mole of butane, C4H10?

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How many moles of molecular oxygen are consumed by the complete combustion of one mole of butane, C₄H₁₀?