Question 1

Provide an acceptable name for the compound below.

Accepted Answer

bicyclo[2....

Question 2

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

Question 3

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

Accepted Answer

C₆H₁₂ + 9 O₂ →...

Question 4

Draw the most stable conformation of trans-1,4-dipropylcyclohexane.

Accepted Answer

The answer of Draw the most stable conformation of trans-1,4-dipropylcyclohexane....

Question 5

Arrange the following conformers of butane in order of energy, lowest to highest: eclipsed, totally eclipsed, gauche, and anti.

Accepted Answer

anti < gau...

Question 6

Identify the correct IUPAC name for the structure shown below.

Accepted Answer

A)   1-tert-butyl-2-chloro-5-bromocycloheptane
B)   5-bromo-1-tert-butyl-2-chlorocycloheptane
C)   1-bromo-4-chloro-5-tertbutylcycloheptane
D)   1-bromo-4-tert-butyl-5-chlorocycloheptane
E)   1-tert-butyl-4-bromo-7-chlorocycloheptane

Question 7

Without any change in conformation, translate the Newman projection shown below to a perspective structure.

Accepted Answer

The answer of Without any change in conformation, translate the...

Question 8

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

Question 9

The twisted boat conformation of cyclohexane is actually a slightly lower energy conformation than the boat conformation. Which of the following accurately describes one factor involved in this structural behavior ?

Accepted Answer

A)   lower angle strain in the boat
B)   higher torsional strain in the twisted boat
C)   fewer unfavorable steric factors in the twisted boat
D)   increased rotational freedom in the boat
E)   lower bond strain in the boat

Question 10

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

Question 11

Consider rotation about the C3-C4 bond of hexane, and draw the Newman projection for the most stable conformation.

Accepted Answer

The answer of Consider rotation about the C3-C4 bond of...

Question 12

Draw the most stable conformation of cis-1,4-dipropylcyclohexane.

Accepted Answer

The answer of Draw the most stable conformation of cis-1,4-dipropylcyclohexane....

Question 13

In the lowest energy conformation of the compound below, how many alkyl substituents are axial?

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   6

Question 14

Why are alkanes described as$\underline{\text{ hydrophobic?  }}$

Accepted Answer

Alkanes are nonpolar...

Question 15

Which of the following statements regarding cyclobutane is correct?

Accepted Answer

A)   The lowest energy conformation of cyclobutane is a planar one in which all of the bond angles is 90°.
B)   The lowest energy conformation of cyclobutane is known as the chair conformation.
C)   The lowest energy conformation is one in which the bond angles are slightly less than 90° even though this increases angle strain.
D)   The lowest energy conformation is one in which the bond angles are greater than 90° so that angle strain is significantly reduced.
E)   None of the above statements is correct.

Question 16

Straight-chain alkanes are also called ________.

Accepted Answer

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

Question 17

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 18

Draw the Newman projection of the highest 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 highest...

Question 19

Which of the statements below correctly describes the chair conformations of

Accepted Answer

A)   The two chair conformations are of equal energy.
B)   The higher energy chair conformation contains one axial methyl group and one equatorial methyl group.
C)   The lower energy chair conformation contains one axial methyl group and one equatorial methyl group.
D)   The higher energy chair conformation contains two axial methyl groups.
E)   The lower energy chair conformation contains two axial methyl groups.

Question 20

Natural gas is primarily composed of

Accepted Answer

A)   oxygen.
B)   carbon dioxide.
C)   methane.
D)   octane.
E)   ethanol.

Exam 3: Structure and Stereochemistry of Alkanes

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

Correct AnswerverifiedShow Answer

Identify the correct IUPAC name for the structure shown below.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC6H12 + 9 O2 →...View AnswerShow Answer

Why are alkanes described as hydrophobic? ‾\underline{\text{ hydrophobic? }} hydrophobic? ​

Correct AnswerverifiedAlkanes are nonpolar...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

The twisted boat conformation of cyclohexane is actually a slightly lower energy conformation than the boat conformation. Which of the following accurately describes one factor involved in this structural behavior ?

Correct AnswerverifiedShow Answer

Which of the statements below correctly describes the chair conformations of

Correct AnswerverifiedShow Answer

Draw the most stable conformation of cis-1,4-dipropylcyclohexane.

Correct AnswerverifiedShow Answer

Which of the following statements regarding cyclobutane is correct?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Without any change in conformation, translate the Newman projection shown below to a perspective structure.

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Draw the most stable conformation of trans-1,4-dipropylcyclohexane.

Correct AnswerverifiedShow Answer

Straight-chain alkanes are also called ________.

Correct AnswerverifiedShow Answer

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

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In the lowest energy conformation of the compound below, how many alkyl substituents are axial?

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Natural gas is primarily composed of

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

Correct AnswerverifiedShow Answer

Consider rotation about the C3-C4 bond of hexane, and draw the Newman projection for the most stable conformation.

Correct AnswerverifiedShow Answer

Arrange the following conformers of butane in order of energy, lowest to highest: eclipsed, totally eclipsed, gauche, and anti.

Correct Answerverifiedanti < gau...View AnswerShow Answer

Provide an acceptable name for the compound below.

Correct Answerverifiedbicyclo[2....View AnswerShow Answer

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

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C₆H₁₂ + 9 O₂ →...
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Why are alkanes described as $\underline{\text{ hydrophobic? }}$

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Alkanes are nonpolar...
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anti < gau...
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bicyclo[2....
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