Question 1

Provide an acceptable name for the alkane shown below.

Accepted Answer

3-ethyl-7-

Question 2

Draw the chair conformation of the cyclohexane derivative shown.

Accepted Answer

The answer of Draw the chair conformation of the cyclohexane...

Question 3

Use a sawhorse structure to depict the eclipsed conformer of ethane.

Accepted Answer

The answer of Use a sawhorse structure to depict the...

Question 4

Draw an acceptable structure for 3-ethyl-3-methylhexane.

Accepted Answer

The answer of Draw an acceptable structure for 3-ethyl-3-methylhexane....

Question 5

A branched alkane has ________ boiling point relative to the isomeric linear alkane. There are ________ London force interactions in the branched alkane

Accepted Answer

A)  a higher; stronger 
B)  a higher; weaker 
C)  a lower, stronger 
D)  a lower; weaker 
E)  the same; similar 
A)  a higher; stronger 
B)  a higher; weaker 
C)  a lower, stronger 
D)  a lower; weaker 
E)  the same; similar

Question 6

Provide an acceptable name for the following compound.

Accepted Answer

isobutylcyclopentane

Question 7

Provide a representation of the $\underline{\text{  gauche  }}$ conformer of butane.

Accepted Answer

The answer of Provide a representation of the \(\underline{\text{ ...

Question 8

Which alkanes have largely replaced Freons as propellants in aerosol cans?

Accepted Answer

A)  methane and ethane 
B)  propane and butane 
C)  pentane and hexane 
D)  nonane and decane 
E)  none of the above 
A)  methane and ethane 
B)  propane and butane 
C)  pentane and hexane 
D)  nonane and decane 
E)  none of the above

Question 9

How many methylene groups are present in 2,4-dimethylhexane?

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  6 
E)  8 
A)  0 
B)  1 
C)  2 
D)  6 
E)  8

Question 10

Name the alkane shown.
[(CH3)2CH]2CHCH3

Accepted Answer

2,3,4-trim

Question 11

Give structures for the three isomers with molecular formula C5H12 and provide the common name of each.

Accepted Answer

Question 12

Which of the statements below correctly describes the chair conformations of

Accepted Answer

A)  The two chair conformations are equal in energy. 
B)  The higher energy chair conformation contains two axial ethyl groups. 
C)  The higher energy chair conformation contains two equatorial ethyl groups. 
D)  The lower energy chair conformation contains two axial ethyl groups. 
E)  The lower energy chair conformation contains two equatorial ethyl groups. 
A)  The two chair conformations are equal in energy. 
B)  The higher energy chair conformation contains two axial ethyl groups. 
C)  The higher energy chair conformation contains two equatorial ethyl groups. 
D)  The lower energy chair conformation contains two axial ethyl groups. 
E)  The lower energy chair conformation contains two equatorial ethyl groups.

Question 13

Draw the Newman projection of the highest energy conformation that results from rotation about the C2-C3 bond of 2,2-dimethylbutane.

Accepted Answer

The answer of Draw the Newman projection of the highest...

Question 14

How many methyl groups are present in 2,4-dimetylhexane?

Accepted Answer

A)  0 
B)  2 
C)  4 
D)  6 
E)  8 
A)  0 
B)  2 
C)  4 
D)  6 
E)  8

Question 15

Which of the following difluorocyclohexane isomers has the greatest molecular dipole in its least stable chair conformation?

Accepted Answer

A)  cis 1,2-difluorocyclohexane 
B)  trans 1,2-difluorocyclohexane 
C)  cis 1,3-difluorocyclohexane 
D)  trans 1,3-difluorocyclohexane 
A)  cis 1,2-difluorocyclohexane 
B)  trans 1,2-difluorocyclohexane 
C)  cis 1,3-difluorocyclohexane 
D)  trans 1,3-difluorocyclohexane

Question 16

Which intermolecular force is primarily responsible for the interactions among alkane molecules?

Accepted Answer

van der Wa

Question 17

Which of the following correctly lists the conformations of cis-1,4-di-t-butylcylcohexane in order of increasing energy?

Accepted Answer

A)  chair < boat < twist boat < half-chair 
B)  twist boat < boat < chair < half-chair 
C)  chair < twist boat < half-chair < boat 
D)  boat < chair < twisted boat < half-chair 
E)  half-chair < chair < boat < twisted boat 
A)  chair < boat < twist boat < half-chair 
B)  twist boat < boat < chair < half-chair 
C)  chair < twist boat < half-chair < boat 
D)  boat < chair < twisted boat < half-chair 
E)  half-chair < chair < boat < twisted boat

Question 18

________ is the reaction process through which long-chain alkanes are converted into a mixture of short-chain alkanes and alkenes.

Accepted Answer

The answer of ________ is the reaction process through which...

Question 19

Consider the three isomeric alkanes n-hexane, 2,3-dimethylbutane, and 2-methylpentane. Which of the following correctly lists these compounds in order of increasing boiling point?

Accepted Answer

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

Question 20

Draw an acceptable structure for 1-ethyl-2-(2,2-dimethylpentyl)cyclopentane.

Accepted Answer

The answer of Draw an acceptable structure for 1-ethyl-2-(2,2-dimethylpentyl)cyclopentane....

Exam 3: Structure and Stereochemistry of Alkanes

Provide an acceptable name for the alkane shown below.

Draw the chair conformation of the cyclohexane derivative shown.

Use a sawhorse structure to depict the eclipsed conformer of ethane.

Draw an acceptable structure for 3-ethyl-3-methylhexane.

A branched alkane has ________ boiling point relative to the isomeric linear alkane. There are ________ London force interactions in the branched alkane

Provide an acceptable name for the following compound.

Provide a representation of the gauche ‾\underline{\text{ gauche }} gauche ​ conformer of butane.

Which alkanes have largely replaced Freons as propellants in aerosol cans?

How many methylene groups are present in 2,4-dimethylhexane?

Name the alkane shown. [(CH3)2CH]2CHCH3

Give structures for the three isomers with molecular formula C5H12 and provide the common name of each.

Which of the statements below correctly describes the chair conformations of

Draw the Newman projection of the highest energy conformation that results from rotation about the C2-C3 bond of 2,2-dimethylbutane.

How many methyl groups are present in 2,4-dimetylhexane?

Which of the following difluorocyclohexane isomers has the greatest molecular dipole in its least stable chair conformation?

Which intermolecular force is primarily responsible for the interactions among alkane molecules?

Which of the following correctly lists the conformations of cis-1,4-di-t-butylcylcohexane in order of increasing energy?

________ is the reaction process through which long-chain alkanes are converted into a mixture of short-chain alkanes and alkenes.

Consider the three isomeric alkanes n-hexane, 2,3-dimethylbutane, and 2-methylpentane. Which of the following correctly lists these compounds in order of increasing boiling point?

Draw an acceptable structure for 1-ethyl-2-(2,2-dimethylpentyl)cyclopentane.

Introduction and Review

Structure and Properties of Organic Molecules

The Study of Chemical Reactions

Stereochemistry

Alkyl Halides: Nucleophilic Substitution and Elimination

Structure and Synthesis of Alkenes

Reactions of Alkenes

Alkynes

Structure and Synthesis of Alcohols

Reactions of Alcohols

Infrared Spectroscopy and Mass Spectrometry

Nuclear Magnetic Resonance Spectroscopy

Ethers, Epoxides, and Thioethers

Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy

Aromatic Compounds

Reactions of Aromatic Compounds

Ketones and Aldehydes

Amines

Carboxylic Acids

Carboxylic Acid Derivatives

Condensations and Alpha Substitutions of Carboxyl Compounds

Carbohydrates and Nucleic Acids

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

Filters

A branched alkane has boiling point relative to the isomeric linear alkane. There are London force interactions in the branched alkane

Provide a representation of the $\underline{\text{ gauche }}$ conformer of butane.

Name the alkane shown. [(CH₃)₂CH]₂CHCH₃

Give structures for the three isomers with molecular formula C₅H₁₂ and provide the common name of each.