Question 1

Which of the following compounds contains a carbon-carbon double bond?

Accepted Answer

A)  ethane 
B)  ethylene 
C)  methylene 
D)  acetylene 
A)  ethane 
B)  ethylene 
C)  methylene 
D)  acetylene

Question 2

What is the IUPAC name of the given compound?

Accepted Answer

A)  2-isopropyl-2,3-dimethylpentane 
B)  2-sec-butyl-2-isopropylpropane 
C)  2,3,3,4-tetramethylhexane 
D)  none of these 
A)  2-isopropyl-2,3-dimethylpentane 
B)  2-sec-butyl-2-isopropylpropane 
C)  2,3,3,4-tetramethylhexane 
D)  none of these

Question 3

A student named a compound 2-methyl-2-ethylbutane. Although this name correctly represents the connectivity of the compound, it is not a valid IUPAC name. What is the correct IUPAC name of this compound?

Accepted Answer

A)  2-ethyl-2-methylbutane 
B)  3,3-dimethylpentane 
C)  2,2-diethylpropane 
D)  2,2-dimethylpentane 
A)  2-ethyl-2-methylbutane 
B)  3,3-dimethylpentane 
C)  2,2-diethylpropane 
D)  2,2-dimethylpentane

Question 4

What is the bond angle in cyclopentane?

Accepted Answer

A)  109.5° 
B)  108.5° 
C)  90° 
D)  180° 
A)  109.5° 
B)  108.5° 
C)  90° 
D)  180°

Question 5

Which of the following hydrocarbons contains the maximum number of carbon atoms?

Accepted Answer

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

Question 6

Consider the following ball-and-stick model.   If the hydrogen atom indicated by the arrow is replaced by a butyl group, what will be the name of the resulting compound?

Accepted Answer

A)  decane 
B)  nonane 
C)  octane 
D)  None of these are correct names for the resulting compound. 
A)  decane 
B)  nonane 
C)  octane 
D)  None of these are correct names for the resulting compound.

Question 7

Which of the following ring sizes of cycloalkanes are found in abundance in nature?

Accepted Answer

A)  3 and 4 carbon atom rings 
B)  4 and 5 carbon atom rings 
C)  5 and 6 carbon atom rings 
D)  6 and 7 carbon atom rings 
A)  3 and 4 carbon atom rings 
B)  4 and 5 carbon atom rings 
C)  5 and 6 carbon atom rings 
D)  6 and 7 carbon atom rings

Question 8

Consider the following ball-and-stick model.   If the hydrogen atom indicated by the arrow is replaced by a propyl group, what will be the name of the resulting compound?

Accepted Answer

A)  2-propylpentane 
B)  4-methylheptane 
C)  octane 
D)  None of these are correct names for the resulting compound. 
A)  2-propylpentane 
B)  4-methylheptane 
C)  octane 
D)  None of these are correct names for the resulting compound.

Question 9

Which of the following Freons has an atmospheric lifetime of 45 years?

Accepted Answer

A)  CFC-11 
B)  CFC-12 
C)  CFC-113 
D)  CFC-22 
A)  CFC-11 
B)  CFC-12 
C)  CFC-113 
D)  CFC-22

Question 10

Which of the following compounds is an alkane?

Accepted Answer

A)  C5H10 
B)  C6H10 
C)  C7H18 
D)  C8H18 
A)  C5H10 
B)  C6H10 
C)  C7H18 
D)  C8H18

Question 11

Of the given compounds, which compound is not a constitutional isomer of the other three compounds? 2,3-dimethylpentane, 3-ethylpentane, 2,2-dimethylbutane, and 3-methylhexane

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 12

Which of the following is true of heptane and 2,2,3-trimethylbutane?

Accepted Answer

A)  They have the same melting point. 
B)  They have the same boiling point. 
C)  They have the same melting and boiling point. 
D)  None of these. 
A)  They have the same melting point. 
B)  They have the same boiling point. 
C)  They have the same melting and boiling point. 
D)  None of these.

Question 13

What is the typical size of hydrocarbons found in lubricating oil?

Accepted Answer

A)  C5 to C12 
B)  C12 to C16 
C)  C15 to C18 
D)  C16 to C20 
A)  C5 to C12 
B)  C12 to C16 
C)  C15 to C18 
D)  C16 to C20

Question 14

Which of the following atmospheric entities is affected when exposed to Freons?

Accepted Answer

A)  carbon dioxide 
B)  carbon monoxide 
C)  oxygen 
D)  ozone 
A)  carbon dioxide 
B)  carbon monoxide 
C)  oxygen 
D)  ozone

Question 15

In the context of refining petroleum, which of the following is the most volatile fraction of the fractional distillation tower?

Accepted Answer

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

Question 16

Which of the following is a constitutional isomer of butane?

Accepted Answer

A)  CH3CH2CH2CH2CH2CH2CH2CH3 
B)    
C)    
D)  all of these 
A)  CH3CH2CH2CH2CH2CH2CH2CH3 
B)    
C)    
D)  all of these

Question 17

The production of chloromethane by the reaction of methane gas with chlorine gas is an example of which type of reaction?

Accepted Answer

A)  oxidation 
B)  reduction 
C)  substitution 
D)  combustion 
A)  oxidation 
B)  reduction 
C)  substitution 
D)  combustion

Question 18

Octane is an alkane having eight carbon atoms in its carbon chain. What is the total number of hydrogen atoms in octane?

Accepted Answer

A)  22 
B)  16 
C)  18 
D)  20 
A)  22 
B)  16 
C)  18 
D)  20

Question 19

What is the IUPAC name of the following compound?

Accepted Answer

A)  diethylcyclopentane 
B)  butylcyclopentane 
C)  1,1-diethylcyclopentane 
D)  1,1-diethylcyclohexane 
A)  diethylcyclopentane 
B)  butylcyclopentane 
C)  1,1-diethylcyclopentane 
D)  1,1-diethylcyclohexane

Question 20

Which of the following compounds are constitutional isomers?       ​ ​
​

Accepted Answer

A)  (i) and (ii) 
B)  (i) and (iii) 
C)  (ii) and (iii) 
D)  all of these 
A)  (i) and (ii) 
B)  (i) and (iii) 
C)  (ii) and (iii) 
D)  all of these

Exam 11: Alkanes

Which of the following compounds contains a carbon-carbon double bond?

What is the IUPAC name of the given compound?

A student named a compound 2-methyl-2-ethylbutane. Although this name correctly represents the connectivity of the compound, it is not a valid IUPAC name. What is the correct IUPAC name of this compound?

What is the bond angle in cyclopentane?

Which of the following hydrocarbons contains the maximum number of carbon atoms?

Consider the following ball-and-stick model. If the hydrogen atom indicated by the arrow is replaced by a butyl group, what will be the name of the resulting compound?

Which of the following ring sizes of cycloalkanes are found in abundance in nature?

Consider the following ball-and-stick model. If the hydrogen atom indicated by the arrow is replaced by a propyl group, what will be the name of the resulting compound?

Which of the following Freons has an atmospheric lifetime of 45 years?

Which of the following compounds is an alkane?

Of the given compounds, which compound is not a constitutional isomer of the other three compounds? 2,3-dimethylpentane, 3-ethylpentane, 2,2-dimethylbutane, and 3-methylhexane

Which of the following is true of heptane and 2,2,3-trimethylbutane?

What is the typical size of hydrocarbons found in lubricating oil?

Which of the following atmospheric entities is affected when exposed to Freons?

In the context of refining petroleum, which of the following is the most volatile fraction of the fractional distillation tower?

Which of the following is a constitutional isomer of butane?

The production of chloromethane by the reaction of methane gas with chlorine gas is an example of which type of reaction?

Octane is an alkane having eight carbon atoms in its carbon chain. What is the total number of hydrogen atoms in octane?

What is the IUPAC name of the following compound?

Which of the following compounds are constitutional isomers? ​ ​ ​

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Which of the following compounds are constitutional isomers?