Question 1

Which of the following has the highest boiling point?

Accepted Answer

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

Question 2

Which of the following is a correct IUPAC name?

Accepted Answer

A)  1-methylhexane 
B)  2-ethylhexane 
C)  3-propylhexane 
D)  none of these 
A)  1-methylhexane 
B)  2-ethylhexane 
C)  3-propylhexane 
D)  none of these

Question 3

What is the IUPAC name of the given compound?

Accepted Answer

A)  2-sec-butyl-2-propylbutane 
B)  4-ethyl-3,4-dimethylheptane 
C)  3,4-dimethyl-3-propylhexane 
D)  none of these 
A)  2-sec-butyl-2-propylbutane 
B)  4-ethyl-3,4-dimethylheptane 
C)  3,4-dimethyl-3-propylhexane 
D)  none of these

Question 4

How is a isobutyl group formed?

Accepted Answer

A)  by removing a hydrogen atom from the first carbon of butane 
B)  by removing a hydrogen atom from the second carbon of butane 
C)  by removing a hydrogen atom from the first carbon of 2-methylpropane 
D)  by removing a hydrogen atom from the second carbon of 2-methylpropane 
A)  by removing a hydrogen atom from the first carbon of butane 
B)  by removing a hydrogen atom from the second carbon of butane 
C)  by removing a hydrogen atom from the first carbon of 2-methylpropane 
D)  by removing a hydrogen atom from the second carbon of 2-methylpropane

Question 5

Which of the following is a correct IUPAC name?

Accepted Answer

A)  1-methyl-4-ethylcyclohexane 
B)  cis-1,4-dimethylcyclohexane 
C)  cis-1,1,2-trimethylcyclohexane 
D)  1-methyl-1-ethylcyclobutane 
A)  1-methyl-4-ethylcyclohexane 
B)  cis-1,4-dimethylcyclohexane 
C)  cis-1,1,2-trimethylcyclohexane 
D)  1-methyl-1-ethylcyclobutane

Question 6

Which of the following is true of an alkane's line-angle formula?

Accepted Answer

A)  A line represents a carbon-carbon bond. 
B)  A vertex represents a hydrogen atom. 
C)  A line ending in space represents a methylene group. 
D)  All of these are correct. 
A)  A line represents a carbon-carbon bond. 
B)  A vertex represents a hydrogen atom. 
C)  A line ending in space represents a methylene group. 
D)  All of these are correct.

Question 7

Which of the following is the correct IUPAC rule for naming an alkyl group?

Accepted Answer

A)  The suffix -yl is added to the name of the parent hydrocarbon. 
B)  The suffix -ane is replaced with the suffix -yl. 
C)  The suffix -ane is replaced with the suffix -anyl. 
D)  The suffix -yl is inserted before the suffix -ane. 
A)  The suffix -yl is added to the name of the parent hydrocarbon. 
B)  The suffix -ane is replaced with the suffix -yl. 
C)  The suffix -ane is replaced with the suffix -anyl. 
D)  The suffix -yl is inserted before the suffix -ane.

Question 8

Which of the following is true when there is a methyl group bonded to cyclohexane?

Accepted Answer

A)  The methyl group will orient itself in the axial position. 
B)  The methyl group will orient itself in the equatorial position. 
C)  The methyl group first orients itself in the equatorial position then changes to the axial position. 
D)  The methyl group first orients itself in the axial position then changes to the equatorial position. 
A)  The methyl group will orient itself in the axial position. 
B)  The methyl group will orient itself in the equatorial position. 
C)  The methyl group first orients itself in the equatorial position then changes to the axial position. 
D)  The methyl group first orients itself in the axial position then changes to the equatorial position.

Question 9

Which of the following is a constitutional isomer of hexane?

Accepted Answer

A)  CH3CH2CH2CH2CH2CH2CH2CH3 
B)    
C)  both CH3CH2CH2CH2CH2CH2CH2CH3 and   
D)  none of these 
A)  CH3CH2CH2CH2CH2CH2CH2CH3 
B)    
C)  both CH3CH2CH2CH2CH2CH2CH2CH3 and   
D)  none of these

Question 10

Which pair of petroleum derivates is the least volatile fraction extracted from a fractional distillation tower?

Accepted Answer

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

Question 11

How many constitutional isomers have the molecular formula C6H14?

Accepted Answer

A)  4 
B)  5 
C)  6 
D)  7 
A)  4 
B)  5 
C)  6 
D)  7

Question 12

What is the name given to a -CH2- group?

Accepted Answer

A)  methane 
B)  methoxy 
C)  methylene 
D)  methyl 
A)  methane 
B)  methoxy 
C)  methylene 
D)  methyl

Question 13

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

Accepted Answer

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

Question 14

Why do alkanes have different conformations?

Accepted Answer

A)  because they have free rotation about their C-H bonds 
B)  because they have free rotation about their C-C bonds 
C)  because they have restricted rotation about their C-H bonds 
D)  because they have highly reactive C-C bonds 
A)  because they have free rotation about their C-H bonds 
B)  because they have free rotation about their C-C bonds 
C)  because they have restricted rotation about their C-H bonds 
D)  because they have highly reactive C-C bonds

Question 15

What is the correct IUPAC name for the following compound?

Accepted Answer

A)  3,3-diethyl-6-methylheptane 
B)  isododecane 
C)  3,3-dimethyl-6-ethylheptane 
D)  1,1,1-triethyl-4-methylpentane 
A)  3,3-diethyl-6-methylheptane 
B)  isododecane 
C)  3,3-dimethyl-6-ethylheptane 
D)  1,1,1-triethyl-4-methylpentane

Question 16

How are the following two compounds related to each other?

Accepted Answer

A)  They are stereoisomers of each other. 
B)  They are constitutional isomers of each other. 
C)  They are functional isomers of each other. 
D)  They are enantiomers of each other. 
A)  They are stereoisomers of each other. 
B)  They are constitutional isomers of each other. 
C)  They are functional isomers of each other. 
D)  They are enantiomers of each other.

Question 17

Which of the following represents the molecular formula of a noncyclic alkane?

Accepted Answer

A)  C5H10 
B)  C6H12 
C)  C4H8 
D)  none of these 
A)  C5H10 
B)  C6H12 
C)  C4H8 
D)  none of these

Question 18

Identify a correct statement about the chair conformation of cyclohexane.

Accepted Answer

A)  1, 3, and 4 represent axial positions, whereas 2 and 5 represent equatorial positions. 
B)  1, 3, and 4 represent equatorial positions, whereas 2 and 5 represent axial positions. 
C)  All the hydrogen atoms represent equatorial positions. 
D)  All the hydrogen atoms represent axial positions. 
A)  1, 3, and 4 represent axial positions, whereas 2 and 5 represent equatorial positions. 
B)  1, 3, and 4 represent equatorial positions, whereas 2 and 5 represent axial positions. 
C)  All the hydrogen atoms represent equatorial positions. 
D)  All the hydrogen atoms represent axial positions.

Question 19

Which of the following is true of a hydrocarbon with a branched chain?

Accepted Answer

A)  The longest chain of carbon atoms is the parent chain, and its name becomes the root name. 
B)  The shortest chain of carbon atoms is the parent chain, and its name becomes the root name. 
C)  The longest chain of carbon atoms is the parent chain, and its name becomes the root name and the shortest chain of carbon atoms is the parent chain, and its name becomes the root name. 
D)  None of these. 
A)  The longest chain of carbon atoms is the parent chain, and its name becomes the root name. 
B)  The shortest chain of carbon atoms is the parent chain, and its name becomes the root name. 
C)  The longest chain of carbon atoms is the parent chain, and its name becomes the root name and the shortest chain of carbon atoms is the parent chain, and its name becomes the root name. 
D)  None of these.

Question 20

What is the typical size of hydrocarbons found in gasoline?

Accepted Answer

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

Exam 11: Alkanes

Which of the following has the highest boiling point?

Which of the following is a correct IUPAC name?

What is the IUPAC name of the given compound?

How is a isobutyl group formed?

Which of the following is a correct IUPAC name?

Which of the following is true of an alkane's line-angle formula?

Which of the following is the correct IUPAC rule for naming an alkyl group?

Which of the following is true when there is a methyl group bonded to cyclohexane?

Which of the following is a constitutional isomer of hexane?

Which pair of petroleum derivates is the least volatile fraction extracted from a fractional distillation tower?

How many constitutional isomers have the molecular formula C6H14?

What is the name given to a -CH2- group?

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

Why do alkanes have different conformations?

What is the correct IUPAC name for the following compound?

How are the following two compounds related to each other?

Which of the following represents the molecular formula of a noncyclic alkane?

Identify a correct statement about the chair conformation of cyclohexane.

Which of the following is true of a hydrocarbon with a branched chain?

What is the typical size of hydrocarbons found in gasoline?

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How many constitutional isomers have the molecular formula C₆H₁₄?

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