Question 1

Which of the following is not a chemical property of alkanes?

Accepted Answer

A)  Alkanes are highly reactive. 
B)  The oxidation of alkanes is known as combustion. 
C)  Alkanes react with halogens to form haloalkanes. 
D)  Heat is released when alkanes are oxidized. 
A)  Alkanes are highly reactive. 
B)  The oxidation of alkanes is known as combustion. 
C)  Alkanes react with halogens to form haloalkanes. 
D)  Heat is released when alkanes are oxidized.

Question 2

What are the products obtained from the complete oxidation of methane?

Accepted Answer

A)  CO2 and O2 
B)  CO2 and H2O 
C)  CO and O2 
D)  H2O and O2 
A)  CO2 and O2 
B)  CO2 and H2O 
C)  CO and O2 
D)  H2O and O2

Question 3

Which of the following are constitutional isomers? (i) CH3CH2CH2CH2CH2CH2CH2CH3
(ii) 
 
  (iii)

Accepted Answer

A)  only (i) and (ii) 
B)  only (i) and (iii) 
C)  only (ii) and (iii) 
D)  none of these 
A)  only (i) and (ii) 
B)  only (i) and (iii) 
C)  only (ii) and (iii) 
D)  none of these

Question 4

What is the molecular formula of the following compound?

Accepted Answer

A)  C8H20 
B)  C8H16 
C)  C8H17 
D)  C8H18 
A)  C8H20 
B)  C8H16 
C)  C8H17 
D)  C8H18

Question 5

Which of the following has the lowest boiling point?

Accepted Answer

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

Question 6

Students were shown the structure of an alkane and were asked to write the IUPAC name of the alkane for an exam. Of the following answers that were given, which answer corresponds to the correct IUPAC name of a compound?

Accepted Answer

A)  2-ethyl-2-methylbutane 
B)  2,2-dimethylbutane 
C)  2,2-diethylbutane 
D)  none of these 
A)  2-ethyl-2-methylbutane 
B)  2,2-dimethylbutane 
C)  2,2-diethylbutane 
D)  none of these

Question 7

Which of the following molecules have the trans configuration?

Accepted Answer

A)  (i) and (ii) 
B)  (i) and (iii) 
C)  only (ii) 
D)  only (i) 
A)  (i) and (ii) 
B)  (i) and (iii) 
C)  only (ii) 
D)  only (i)

Question 8

Which of the following molecules can exist as cis-trans isomers?

Accepted Answer

A)  1-ethyl-2-methylcyclohexane 
B)  1-ethyl-1-methylcyclohexane 
C)  both 1-ethyl-2-methylcyclohexane and 1-ethyl-1-methylcyclohexane 
D)  none of these 
A)  1-ethyl-2-methylcyclohexane 
B)  1-ethyl-1-methylcyclohexane 
C)  both 1-ethyl-2-methylcyclohexane and 1-ethyl-1-methylcyclohexane 
D)  none of these

Question 9

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

Accepted Answer

A)  boat 
B)  chair 
C)  envelope 
D)  twist 
A)  boat 
B)  chair 
C)  envelope 
D)  twist

Question 10

During the refining of petroleum, which of the following is the least volatile fraction of the fractional distillation tower?

Accepted Answer

A)  kerosene 
B)  lubricating oil 
C)  asphalt 
D)  fuel oil 
A)  kerosene 
B)  lubricating oil 
C)  asphalt 
D)  fuel oil

Question 11

Which of the following line-angle structures is 4-isopropyloctane?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 12

What is the IUPAC name of the following compound?

Accepted Answer

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

Question 13

Identify the given alkane.

Accepted Answer

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

Question 14

Which of the following line-angle formulas represents butane?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 15

Which of the following will be insoluble in water?

Accepted Answer

A)  ethane 
B)  octane 
C)  pentane 
D)  all of these 
A)  ethane 
B)  octane 
C)  pentane 
D)  all of these

Question 16

Which of the following is true of the C-H axial bonds in cyclohexane?

Accepted Answer

A)  There are five C-H axial bonds in cyclohexane. 
B)  The C-H axial bonds are oriented parallel to the imaginary axis of the ring. 
C)  The C-H axial bonds are positioned on the same side of the ring. 
D)  All C-H axial bonds point downward. 
A)  There are five C-H axial bonds in cyclohexane. 
B)  The C-H axial bonds are oriented parallel to the imaginary axis of the ring. 
C)  The C-H axial bonds are positioned on the same side of the ring. 
D)  All C-H axial bonds point downward.

Question 17

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 18

Which of the following are representations of the same molecule? (i) CH3CH2CH2CH2CH2CH2CH3
(ii) 
 
  (iii)

Accepted Answer

A)  only (i) and (ii) 
B)  only (i) and (iii) 
C)  only (ii) and (iii) 
D)  none of these 
A)  only (i) and (ii) 
B)  only (i) and (iii) 
C)  only (ii) and (iii) 
D)  none of these

Question 19

Which of the following correctly describes the relationship between butane and 2-methylpropane?

Accepted Answer

A)  They have the same molecular formula. 
B)  They have the same chemical properties. 
C)  They have the same physical properties. 
D)  All of these are true. 
A)  They have the same molecular formula. 
B)  They have the same chemical properties. 
C)  They have the same physical properties. 
D)  All of these are true.

Question 20

Which of the following straight-chain alkanes is denser that water?

Accepted Answer

A)  C6H14 
B)  C20H42 
C)  C40H82 
D)  none of these 
A)  C6H14 
B)  C20H42 
C)  C40H82 
D)  none of these

Exam 11: Alkanes

Which of the following is not a chemical property of alkanes?

What are the products obtained from the complete oxidation of methane?

Which of the following are constitutional isomers? (i) CH3CH2CH2CH2CH2CH2CH2CH3 (ii) (iii)

What is the molecular formula of the following compound?

Which of the following has the lowest boiling point?

Students were shown the structure of an alkane and were asked to write the IUPAC name of the alkane for an exam. Of the following answers that were given, which answer corresponds to the correct IUPAC name of a compound?

Which of the following molecules have the trans configuration?

Which of the following molecules can exist as cis-trans isomers?

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

During the refining of petroleum, which of the following is the least volatile fraction of the fractional distillation tower?

Which of the following line-angle structures is 4-isopropyloctane?

What is the IUPAC name of the following compound?

Identify the given alkane.

Which of the following line-angle formulas represents butane?

Which of the following will be insoluble in water?

Which of the following is true of the C-H axial bonds in cyclohexane?

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

Which of the following are representations of the same molecule? (i) CH3CH2CH2CH2CH2CH2CH3 (ii) (iii)

Which of the following correctly describes the relationship between butane and 2-methylpropane?

Which of the following straight-chain alkanes is denser that water?

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Filters

Which of the following are constitutional isomers? (i) CH₃CH₂CH₂CH₂CH₂CH₂CH₂CH₃ _(ii) _(iii)

Which of the following are representations of the same molecule? (i) CH₃CH₂CH₂CH₂CH₂CH₂CH₃ _(ii) _(iii)