Question 1

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 2

Draw the chair conformation of the cyclohexane derivative shown.

Accepted Answer

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

Question 3

Provide the IUPAC name of (CH3)2CHCH2CH2C(CH3)3.

Accepted Answer

2,2,5-trim

Question 4

Provide an acceptable name for the alkane shown below.

Accepted Answer

The answer of Provide an acceptable name for the alkane...

Question 5

Straight-chain alkanes are also called ________.

Accepted Answer

The answer of Straight-chain alkanes are also called ________....

Question 6

If an acyclic alkane hydrocarbon contains n carbon atoms, how many hydrogen atoms must it also contain?

Accepted Answer

A)  n 
B)  2n 
C)  n + 2 
D)  2n + 2 
E)  n - 2 
A)  n 
B)  2n 
C)  n + 2 
D)  2n + 2 
E)  n - 2

Question 7

If a hydrocarbon has no double or triple bonds, it is said to be ________.

Accepted Answer

The answer of If a hydrocarbon has no double or...

Question 8

The structures below are ________.

Accepted Answer

A)  not isomers 
B)  conformational isomers 
C)  cis-trans isomers 
D)  structural isomers 
E)  both B and D 
A)  not isomers 
B)  conformational isomers 
C)  cis-trans isomers 
D)  structural isomers 
E)  both B and D

Question 9

Linear alkanes generally have higher phase transitions than their branched isomers. However, the melting point of cyclohexane is 6° C while the melting point of hexane is -95° C. Briefly suggest a reason why this is.

Accepted Answer

Cyclohexane is more symmetric molecule a

Question 10

Provide an acceptable name for the following compound.

Accepted Answer

4,4-dichlo

Question 11

Within the context of commercial uses of alkanes, explain what "knocking" is.

Accepted Answer

"Knocking" is the potentially

Question 12

Which of the following statements concerning the conformers of butane is true?

Accepted Answer

A)  Unlike ethane, all butane conformers are classified as eclipsed. 
B)  The lowest energy conformer of butane is the gauche conformer. 
C)  There is more torsional strain in the anti conformer than in the totally eclipsed conformer. 
D)  The eclipsed and totally eclipsed conformers have the same amount of nonbonded strain. 
E)  The gauche and anti conformers differ primarily in the amount of nonbonded strain present. 
A)  Unlike ethane, all butane conformers are classified as eclipsed. 
B)  The lowest energy conformer of butane is the gauche conformer. 
C)  There is more torsional strain in the anti conformer than in the totally eclipsed conformer. 
D)  The eclipsed and totally eclipsed conformers have the same amount of nonbonded strain. 
E)  The gauche and anti conformers differ primarily in the amount of nonbonded strain present.

Question 13

Draw the Newman projection of the anti conformation of butane.

Accepted Answer

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

Question 14

With each structure below drawn in its most stable chair conformation, identify the sequence that ranks the structures in order of increasing stability.

Accepted Answer

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

Question 15

Name the alkane shown.

Accepted Answer

5-ethyl-2,

Question 16

From the perspective of viewing down the C2-C3 bond, draw the Newman projection of the most stable conformation of 2,3-dimethylbutane.

Accepted Answer

The answer of From the perspective of viewing down the...

Question 17

In the complete combustion of heptane, how many moles of water are produced?

Accepted Answer

The answer of In the complete combustion of heptane, how...

Question 18

In the boat conformation of cyclohexane, the "flagpole" hydrogens are located ________.

Accepted Answer

A)  on the same carbon 
B)  on adjacent carbons 
C)  on C-1 and C-3 
D)  on C-1 and C-4 
E)  none of the above 
A)  on the same carbon 
B)  on adjacent carbons 
C)  on C-1 and C-3 
D)  on C-1 and C-4 
E)  none of the above

Question 19

Name the haloalkane shown.
CH3CH2C(CH3)2CH2CH2I

Accepted Answer

1-iodo-3,3

Question 20

Which of the following cycloalkanes has the smallest heat of combustion per CH2 group?

Accepted Answer

A)  cyclopropane 
B)  cyclobutane 
C)  cyclopentane 
D)  cyclohexane 
E)  cycloheptane 
A)  cyclopropane 
B)  cyclobutane 
C)  cyclopentane 
D)  cyclohexane 
E)  cycloheptane

Exam 3: Structure and Stereochemistry of Alkanes

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

Draw the chair conformation of the cyclohexane derivative shown.

Provide the IUPAC name of (CH3)2CHCH2CH2C(CH3)3.

Provide an acceptable name for the alkane shown below.

Straight-chain alkanes are also called ________.

If an acyclic alkane hydrocarbon contains n carbon atoms, how many hydrogen atoms must it also contain?

If a hydrocarbon has no double or triple bonds, it is said to be ________.

The structures below are ________.

Linear alkanes generally have higher phase transitions than their branched isomers. However, the melting point of cyclohexane is 6° C while the melting point of hexane is -95° C. Briefly suggest a reason why this is.

Provide an acceptable name for the following compound.

Within the context of commercial uses of alkanes, explain what "knocking" is.

Which of the following statements concerning the conformers of butane is true?

Draw the Newman projection of the anti conformation of butane.

With each structure below drawn in its most stable chair conformation, identify the sequence that ranks the structures in order of increasing stability.

Name the alkane shown.

From the perspective of viewing down the C2-C3 bond, draw the Newman projection of the most stable conformation of 2,3-dimethylbutane.

In the complete combustion of heptane, how many moles of water are produced?

In the boat conformation of cyclohexane, the "flagpole" hydrogens are located ________.

Name the haloalkane shown. CH3CH2C(CH3)2CH2CH2I

Which of the following cycloalkanes has the smallest heat of combustion per CH2 group?

Structure and Bonding

Acids and Bases; Functional Groups

The Study of Chemical Reactions

Stereochemistry

Alkyl Halides; Nucleophilic Substitution

Structure and Synthesis of Alkenes; Elimination

Reactions of Alkenes

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

Provide the IUPAC name of (CH₃)₂CHCH₂CH₂C(CH₃)₃.

Name the haloalkane shown. CH₃CH₂C(CH₃)₂CH₂CH₂I

Which of the following cycloalkanes has the smallest heat of combustion per CH₂ group?