Question 1

cis-1,2-Dibromocyclohexane is represented by structure(s) :

Accepted Answer

A)  I
B)  II
C)  III
D)  II and III
E)  I and IIF) A) and E)
G) A) and C)

Question 2

What is the index of hydrogen deficiency (or degree of unsaturation) of a compound with the molecular formula of C14H14Cl4?

Accepted Answer

A)  3
B)  4
C)  5
D)  6
E)  7F) D) and E)
G) None of the above

Question 3

Which conformation of trans-1-isopropyl-3-methylcyclohexane would be present in greatest amount at equilibrium?

Accepted Answer

A)  The conformation with the methyl group equatorial and the isopropyl group axial.
B)  The conformation with the methyl group axial and the isopropyl group equatorial.
C)  The conformation with both groups axial.
D)  The conformation with both groups equatorial.
E)  The twist boat conformation.F) B) and D)
G) C) and D)

Question 4

Which conformation(s) of 1,2-dibromoethane does not illustrate one or more gauche interactions?

Accepted Answer

A)  I and II only
B)  II,III,and V only
C)  I,III,and IV only
D)  II and III only
E)  All these choicesF) B) and C)
G) A) and C)

Question 5

Consider the graph below,which is a plot of the relative energies of the various conformations of 2,3-dimethylbutane,viewed through the C-2-C-3 bond.The conformations corresponding to the 120o and 240o are: o and 240o are:   A) eclipsed,more stable than the conformation at 0o B) eclipsed,more stable than the conformation at 180o C) staggered,more stable than the conformation at 0o D) staggered,less stable than the conformation at 180o E) two of these choices are true" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  eclipsed,more stable than the conformation at 0o
B)  eclipsed,more stable than the conformation at 180o
C)  staggered,more stable than the conformation at 0o
D)  staggered,less stable than the conformation at 180o
E)  two of these choices are trueF) B) and D)
G) A) and D)

Question 6

The preferred conformation of cis-3-tert-butyl-1-methylcyclohexane is the one in which:

Accepted Answer

A)  the tert-butyl group is axial and the methyl group is equatorial.
B)  the methyl group is axial and the tert-butyl group is equatorial.
C)  both groups are axial.
D)  both groups are equatorial.
E)  the molecule exists in a boat conformation.F) C) and D)
G) B) and E)

Question 7

Which is the most stable conformation of cyclohexane?

Accepted Answer

A)  Chair
B)  Twist
C)  Boat
D)  Half-chair
E)  StaggeredF) D) and E)
G) A) and B)

Question 8

Give the IUPAC name corresponding to the following structure:

Accepted Answer

5-bromo-6-...

Question 9

The most stable conformation for 1,2-ethanediol (ethylene glycol) is shown below.It is the most stable conformation because

Accepted Answer

A)  this corresponds to an anti conformation.
B)  in general,gauche conformations possess the minimum energy.
C)  it is stabilized by intramolecular hydrogen bonding.
D)  it is a staggered conformation.
E)  it has the highest energy of all the possibilities.F) A) and E)
G) A) and B)

Question 10

Give the IUPAC name for

Accepted Answer

A)  trans-2-methyl-3-hepten-5-yne
B)  trans-6-methyl-4-hepten-2-yne
C)  cis-2-methyl-3-hepten-5-yne
D)  cis-6-methyl-4-hepten-2-yne
E)  none of these choicesF) All of the above
G) A) and E)

Question 11

A correct IUPAC name for the following compound is:

Accepted Answer

A)  2,5-Dimethyl-3-propylheptane
B)  3,6-Dimethyl-5-propylheptane
C)  6-Methyl-4-(1-methylethyl) octane
D)  2-Methyl-3-(2-methylbutyl) hexane
E)  3-Methyl-5-(1-methylethyl) octaneF) B) and D)
G) A) and B)

Question 12

What is the index of hydrogen deficiency (or degree of unsaturation) of the following molecule?

Accepted Answer

A)  2
B)  3
C)  4
D)  5
E)  6F) All of the above
G) A) and C)

Question 13

Which of these is the common name for the 1,1-dimethylpropyl group?

Accepted Answer

A)  tert-Butyl
B)  tert-Pentyl
C)  Isopentyl
D)  Neopentyl
E)  sec-PentylF) C) and D)
G) B) and C)

Question 14

The least stable conformation of 2,3-dimethylpentane,viewed through the C-2-C-3 bond (i.e.,C-2 in the front,C-3 in the back) :

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  VF) A) and B)
G) A) and C)

Question 15

Which of the following compounds has a molecular formula of C6H7O+ and an index of hydrogen deficiency of 4? 6H7O+ and an index of hydrogen deficiency of 4?   A) I B) I and II C) I,II and III D) II and IV E) all of these choices" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  I
B)  I and II
C)  I,II and III
D)  II and IV
E)  all of these choicesF) A) and C)
G) B) and E)

Question 16

How many moles of hydrogen (H2) will react with 5-chlorocyclohex-3-en-1-ol?

Accepted Answer

A)  1 2
B)  2
C)  3
D)  4
E)  None of these choices.F) B) and D)
G) B) and E)

Question 17

What is the most thermodynamically stable chair conformation for the substituents on cis-4-tert-butylcyclohexanol?

Accepted Answer

A)  both groups equatorial
B)  both groups axial
C)  tert-butyl group equatorial and OH group axial
D)  tert-butyl group axial and OH group equatorial
E)  a boat conformation is adopted due to steric strainF) D) and E)
G) A) and E)

Question 18

Give the IUPAC name corresponding to the following structure:

Accepted Answer

3-ethyl-6,7-dimethyl...

Question 19

Draw the bond-line structural formula corresponding to the most stable conformation of the following substance: trans-1-bromo-3-(1-methylpropyl)cyclohexane

Accepted Answer

The answer of Draw the bond-line structural formula corresponding to...

Question 20

What is the index of hydrogen deficiency (or degree of unsaturation) of the following molecule?

Accepted Answer

A)  2
B)  3
C)  4
D)  5
E)  6F) A) and B)
G) A) and C)

Exam 4: Nomenclature and Conformations of Alkanes and Cycloalkanes

Which is the most stable conformation of cyclohexane?

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Consider the graph below,which is a plot of the relative energies of the various conformations of 2,3-dimethylbutane,viewed through the C-2-C-3 bond.The conformations corresponding to the 120o and 240o are:

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Draw the bond-line structural formula corresponding to the most stable conformation of the following substance: trans-1-bromo-3-(1-methylpropyl)cyclohexane

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Which of the following compounds has a molecular formula of C6H7O+ and an index of hydrogen deficiency of 4?

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Which conformation(s) of 1,2-dibromoethane does not illustrate one or more gauche interactions?

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What is the most thermodynamically stable chair conformation for the substituents on cis-4-tert-butylcyclohexanol?

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A correct IUPAC name for the following compound is:

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What is the index of hydrogen deficiency (or degree of unsaturation) of the following molecule?

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What is the index of hydrogen deficiency (or degree of unsaturation) of the following molecule?

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What is the index of hydrogen deficiency (or degree of unsaturation) of a compound with the molecular formula of C14H14Cl4?

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Give the IUPAC name corresponding to the following structure:

Correct Answerverified5-bromo-6-...View AnswerShow Answer

Give the IUPAC name corresponding to the following structure:

Correct Answerverified3-ethyl-6,7-dimethyl...View AnswerShow Answer

Which conformation of trans-1-isopropyl-3-methylcyclohexane would be present in greatest amount at equilibrium?

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The least stable conformation of 2,3-dimethylpentane,viewed through the C-2-C-3 bond (i.e.,C-2 in the front,C-3 in the back) :

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cis-1,2-Dibromocyclohexane is represented by structure(s) :

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How many moles of hydrogen (H2) will react with 5-chlorocyclohex-3-en-1-ol?

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The most stable conformation for 1,2-ethanediol (ethylene glycol) is shown below.It is the most stable conformation because

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The preferred conformation of cis-3-tert-butyl-1-methylcyclohexane is the one in which:

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Which of these is the common name for the 1,1-dimethylpropyl group?

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Give the IUPAC name for

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Consider the graph below,which is a plot of the relative energies of the various conformations of 2,3-dimethylbutane,viewed through the C-2-C-3 bond.The conformations corresponding to the 120^o and 240^o are:

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Which of the following compounds has a molecular formula of C₆H₇O⁺ and an index of hydrogen deficiency of 4?

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What is the index of hydrogen deficiency (or degree of unsaturation) of a compound with the molecular formula of C₁₄H₁₄Cl₄?

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5-bromo-6-...
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3-ethyl-6,7-dimethyl...
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How many moles of hydrogen (H₂) will react with 5-chlorocyclohex-3-en-1-ol?

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