Question 1

What is the name of the following compound?

Accepted Answer

A)  cis-1-methyl-3-ethylcyclopentane 
B)  cis-1-ethyl-3-methylcyclopentane 
C)  trans-1-methyl-3-ethylcyclopentane 
D)  trans-1-ethyl-3-methylcyclopentane 
A)  cis-1-methyl-3-ethylcyclopentane 
B)  cis-1-ethyl-3-methylcyclopentane 
C)  trans-1-methyl-3-ethylcyclopentane 
D)  trans-1-ethyl-3-methylcyclopentane B

Question 2

Which isomer of pentane has the highest boiling point?

Accepted Answer

A)  pentane 
B)  2-methylbutane 
C)  2,2-dimethylpropane 
D)  None, they all have the same boiling point. 
A)  pentane 
B)  2-methylbutane 
C)  2,2-dimethylpropane 
D)  None, they all have the same boiling point. A

Question 3

What is the IUPAC name of the compound below?

Accepted Answer

A)  4-ethyl-4-methyloctane 
B)  3-methyl-3-propylheptane 
C)  2-ethyl-2-propylhexane 
D)  none of these 
A)  4-ethyl-4-methyloctane 
B)  3-methyl-3-propylheptane 
C)  2-ethyl-2-propylhexane 
D)  none of these A

Question 4

What is the correct IUPAC name for the following compound?

Accepted Answer

A)  3,3-diethyl-6-methylheptane 
B)  isododecane 
C)  5,5-diethyl-2-methylheptane 
D)  1,1,1-triethyl-4-methylpentane 
A)  3,3-diethyl-6-methylheptane 
B)  isododecane 
C)  5,5-diethyl-2-methylheptane 
D)  1,1,1-triethyl-4-methylpentane

Question 5

The isobutyl 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

Consider the following ball and stick model.   If the hydrogen atom indicated by the arrow was removed and a -CH2CH2CH2CH3 group was attached, what would the name of the resulting compound?

Accepted Answer

A)  butylpentane 
B)  nonane 
C)  octane 
D)  None of these are a correct name for the resulting compound. 
A)  butylpentane 
B)  nonane 
C)  octane 
D)  None of these are a correct name for the resulting compound.

Question 7

The IUPAC name for one of the freons is 1,1,1-trichloro-2-fluoroethane. How many other constitutional isomers are there of this compound?

Accepted Answer

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

Question 8

Which of the following is not the molecular formula of a noncyclic alkane?

Accepted Answer

A)  C15H32 
B)  C19H38 
C)  C20H42 
D)  C22H46 
A)  C15H32 
B)  C19H38 
C)  C20H42 
D)  C22H46

Question 9

What is the 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 10

How are the following two compounds related to each other?

Accepted Answer

A)  stereoisomers 
B)  constitutional isomers 
C)  different conformations of the same compound 
D)  none of the above 
A)  stereoisomers 
B)  constitutional isomers 
C)  different conformations of the same compound 
D)  none of the above

Question 11

Which of the following are perpendicular to the imaginary plane through the six carbon atoms of cyclohexane?

Accepted Answer

A)  only the axial bonds 
B)  only the equatorial bonds 
C)  both the axial and equatorial bonds 
D)  neither the axial nor the equatorial bonds 
A)  only the axial bonds 
B)  only the equatorial bonds 
C)  both the axial and equatorial bonds 
D)  neither the axial nor the equatorial bonds

Question 12

What is the IUPAC name of the compound below?

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 13

Which of the following represents the molecular formula for an unbranched alkane?

Accepted Answer

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

Question 14

Which of the following is true of branched chain hydrocarbons?

Accepted Answer

A)  The longest carbon chain becomes the root name 
B)  The longest carbon chain is always written horizontally 
C)  both a and b 
D)  neither a nor b 
A)  The longest carbon chain becomes the root name 
B)  The longest carbon chain is always written horizontally 
C)  both a and b 
D)  neither a nor b

Question 15

Which of the following is a gas at room temperature and pressure?

Accepted Answer

A)  butane 
B)  hexane 
C)  pentane 
D)  none of them 
A)  butane 
B)  hexane 
C)  pentane 
D)  none of them

Question 16

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

Accepted Answer

A)  C6H6 
B)  C6H10 
C)  C6H14 
D)  C6H16 
A)  C6H6 
B)  C6H10 
C)  C6H14 
D)  C6H16

Question 17

The IUPAC name for one of the freons is 1,1-dichloro-2,2-difluoroethane. How many other constitutional isomers are there of this compound?

Accepted Answer

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

Question 18

Consider the following ball and stick model.   If the hydrogen atom indicated by the arrow was removed and a -CH2CH2CH3 group was attached, what would the name of the resulting compound?

Accepted Answer

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

Question 19

Given the compounds 2,3-dimethylpentane, 3-ethylpentane and 3-methylhexane, which are constitutional isomers of one another?

Accepted Answer

A)  only 2,3-dimethylpentane and 3-ethylpentane 
B)  only 2,3-dimethylpentane and 3-methylhexane 
C)  only 3-ethylpentane and 3-methylhexane 
D)  They are all constitutional isomers of one another. 
A)  only 2,3-dimethylpentane and 3-ethylpentane 
B)  only 2,3-dimethylpentane and 3-methylhexane 
C)  only 3-ethylpentane and 3-methylhexane 
D)  They are all constitutional isomers of one another.

Question 20

What is the IUPAC name of the compound below?

Accepted Answer

A)  2-ethyl-2-methylpropane 
B)  2,2-dimethylbutane 
C)  3,3-dimethylbutane 
D)  none of these 
A)  2-ethyl-2-methylpropane 
B)  2,2-dimethylbutane 
C)  3,3-dimethylbutane 
D)  none of these

Exam 11: Alkanes

What is the name of the following compound?

Which isomer of pentane has the highest boiling point?

What is the IUPAC name of the compound below?

What is the correct IUPAC name for the following compound?

The isobutyl group is obtained by doing which of the following?

Consider the following ball and stick model. If the hydrogen atom indicated by the arrow was removed and a -CH2CH2CH2CH3 group was attached, what would the name of the resulting compound?

The IUPAC name for one of the freons is 1,1,1-trichloro-2-fluoroethane. How many other constitutional isomers are there of this compound?

Which of the following is not the molecular formula of a noncyclic alkane?

What is the name of the following compound?

How are the following two compounds related to each other?

Which of the following are perpendicular to the imaginary plane through the six carbon atoms of cyclohexane?

What is the IUPAC name of the compound below?

Which of the following represents the molecular formula for an unbranched alkane?

Which of the following is true of branched chain hydrocarbons?

Which of the following is a gas at room temperature and pressure?

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

The IUPAC name for one of the freons is 1,1-dichloro-2,2-difluoroethane. How many other constitutional isomers are there of this compound?

Consider the following ball and stick model. If the hydrogen atom indicated by the arrow was removed and a -CH2CH2CH3 group was attached, what would the name of the resulting compound?

Given the compounds 2,3-dimethylpentane, 3-ethylpentane and 3-methylhexane, which are constitutional isomers of one another?

What is the IUPAC name of the compound below?

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Consider the following ball and stick model. If the hydrogen atom indicated by the arrow was removed and a -CH₂CH₂CH₂CH₃ group was attached, what would the name of the resulting compound?

Consider the following ball and stick model. If the hydrogen atom indicated by the arrow was removed and a -CH₂CH₂CH₃ group was attached, what would the name of the resulting compound?