Question 1

Define the term $\underline{\text{  conformation. }}$

Accepted Answer

Conformations are different ar...

Question 2

Which of the following statements is a correct description of the most stable conformation of 1,1,3-trimethylcyclohexane?

Accepted Answer

A)   The methyl group at C-3 is equatorial.
B)   C-1 is a tertiary carbon and C-3 is a primary carbon.
C)   C-1 is a quaternary carbon and C-3 is a secondary carbon.
D)   C-1 is a tertiary carbon and C-3 is a secondary carbon.
E)   Both methyl groups at C-1 are equatorial.F) A) and B)
G) D) and E)

Question 3

The energy barrier for carbon-carbon bond rotation in propane is mainly due to ________.

Accepted Answer

A)   angle strain
B)   bond strain
C)   muscle strain
D)   steric strain
E)   torsion strainF) B) and E)
G) D) and E)

Question 4

Provide an acceptable name for the alkane shown below.
CH3CH2CH2CH2CH2CH3

Accepted Answer

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

Question 5

Which of the following best describes the molecules of a sample of ethane gas at room temperature?

Accepted Answer

A)   Almost all of the molecules are frozen or locked in the eclipsed conformation.
B)   Almost all of the molecules are frozen or locked in the staggered conformation.
C)   The molecules are rapidly interconverting between the eclipsed and staggered conformations, but at any one time slightly more of them are present in the eclipsed conformation.
D)   The molecules are rapidly interconverting between the eclipsed and staggered conformations, but at any one time slightly more of them are present in the staggered conformation.E) None of the above
F) B) and C)

Question 6

Draw the Newman projection of the lowest energy conformation that results from rotation about the C2-C3 bond of 2-methylbutane.

Accepted Answer

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

Question 7

By using the appropriate molecular formulas, write a balanced equation which describes the complete combustion of nonane.

Accepted Answer

CH₃(CH₂)₇CH₃ +...

Question 8

Provide an acceptable name for the [(CH3)3C]2CHCH3.

Accepted Answer

2,2,3,4,4-...

Question 9

________ is the n-alkane of greatest molecular weight which is a gas at room temperature and pressure.

Accepted Answer

The answer of ________ is the n-alkane of greatest molecular...

Question 10

How many secondary (2°)  carbons are found in 5-ethyl-3,3,4-trimethylheptane?

Accepted Answer

A)   1
B)   4
C)   2
D)   3
E)   6F) B) and D)
G) D) and E)

Question 11

Provide an acceptable name for the alkane shown below.

Accepted Answer

2,2,3,6-te...

Question 12

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 13

Which of the following cycloalkanes exhibits the greatest molar heat of combustion?

Accepted Answer

A)   cyclooctane
B)   cycloheptane
C)   cyclohexane
D)   cyclobutane
E)   cyclopropaneF) C) and D)
G) All of the above

Question 14

Name the alkane shown.

Accepted Answer

5-ethyl-2,...

Question 15

Among the butane conformers, which occur at energy minima on a graph of potential energy versus dihedral angle?

Accepted Answer

A)   gauche only
B)   eclipsed and totally eclipsed
C)   gauche and anti
D)   eclipsed only
E)   anti onlyF) D) and E)
G) B) and C)

Question 16

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.F) B) and E)
G) C) and D)

Question 17

Provide the name of the compound below.

Accepted Answer

2,3,6,7-te...

Question 18

When one compares the densities of n-hexane and water, one finds:

Accepted Answer

A)   that n-hexane is less dense than water.
B)   that n-hexane is more dense than water.
C)   that these two compounds have the same density.
D)   that the relative densities of two immiscible compounds cannot be measured.E) None of the above
F) All of the above

Question 19

Name the two major steps in the refining of crude oil into usable hydrocarbon products.

Accepted Answer

1. fractional distil...

Question 20

Identify the correct IUPAC name for the following structure.

Accepted Answer

A)   6-bromo-1-cyclopentyl-3,6-dimethylhexane
B)   1-bromo-5-cyclopentyl-1,4-dimethylpentane
C)   2-bromo-6-cyclopentyl-5-methylhexane
D)   5-bromo-1-cyclopentyl-2-methylhexane
E)   none of the aboveF) A) and C)
G) B) and D)

Exam 3: Structure and Stereochemistry of Alkanes

Provide an acceptable name for the alkane shown below. CH3CH2CH2CH2CH2CH3

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How many secondary (2°) carbons are found in 5-ethyl-3,3,4-trimethylheptane?

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Which of the following best describes the molecules of a sample of ethane gas at room temperature?

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

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When one compares the densities of n-hexane and water, one finds:

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

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Which of the following statements is a correct description of the most stable conformation of 1,1,3-trimethylcyclohexane?

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Identify the correct IUPAC name for the following structure.

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Name the two major steps in the refining of crude oil into usable hydrocarbon products.

Correct Answerverified1. fractional distil...View AnswerShow Answer

Define the term conformation. ‾\underline{\text{ conformation. }} conformation. ​

Correct AnswerverifiedConformations are different ar...View AnswerShow Answer

The energy barrier for carbon-carbon bond rotation in propane is mainly due to ________.

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By using the appropriate molecular formulas, write a balanced equation which describes the complete combustion of nonane.

Correct AnswerverifiedCH3(CH2)7CH3 +...View AnswerShow Answer

Among the butane conformers, which occur at energy minima on a graph of potential energy versus dihedral angle?

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Which of the following cycloalkanes exhibits the greatest molar heat of combustion?

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________ is the n-alkane of greatest molecular weight which is a gas at room temperature and pressure.

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Draw the Newman projection of the lowest energy conformation that results from rotation about the C2-C3 bond of 2-methylbutane.

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Provide the name of the compound below.

Correct Answerverified2,3,6,7-te...View AnswerShow Answer

Provide an acceptable name for the [(CH3)3C]2CHCH3.

Correct Answerverified2,2,3,4,4-...View AnswerShow Answer

Provide an acceptable name for the alkane shown below.

Correct Answerverified2,2,3,6-te...View AnswerShow Answer

Name the alkane shown.

Correct Answerverified5-ethyl-2,...View AnswerShow Answer

Provide an acceptable name for the alkane shown below. CH₃CH₂CH₂CH₂CH₂CH₃

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1. fractional distil...
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Define the term $\underline{\text{ conformation. }}$

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Conformations are different ar...
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CH₃(CH₂)₇CH₃ +...
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2,3,6,7-te...
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Provide an acceptable name for the [(CH₃)₃C]₂CHCH₃.

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2,2,3,4,4-...
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2,2,3,6-te...
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5-ethyl-2,...
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