Question 1

Which of the following information is primarily obtained from an IR spectrum?

Accepted Answer

A)  Conjugated p system present in a compound.
B)  Functional groups present in a compound.
C)  Molecular weight of a compound.
D)  The carbon and hydrogen framework of a compound.E) None of the above
F) All of the above

Question 2

An alkyne C-H bond absorbs at higher wave number than an alkene C-H bond.What does this tell you about the strength of these two bonds?

Accepted Answer

A)  The alkene C-H bond is stronger.
B)  The alkyne C-H bond is stronger.
C)  The alkene C-C bond is stronger.
D)  The alkyne C-C bond is stronger.E) A) and B)
F) A) and C)

Question 3

What type(s) of molecular motion is (are) observed using infrared spectroscopy?

Accepted Answer

A)  Stretching and bending
B)  Rotation and excitation
C)  Spin flipping
D)  FragmentationE) A) and C)
F) B) and C)

Question 4

What type of signal(s) would you observe in the mass and (or) infrared spectrum of the following compound? -1 B) A signal at 3300 cm-1 C) A single mass peak at 92 amu D) Two mass peaks at 92 and 94 amu" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  A signal at 1600 cm-1
B)  A signal at 3300 cm-1
C)  A single mass peak at 92 amu
D)  Two mass peaks at 92 and 94 amuE) B) and C)
F) A) and B)

Question 5

Which of the following statement(s) is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 69 and shows a prominent peak in its IR spectrum at 2250 cm-1?

Accepted Answer

A)  The compound has a molecular mass of 70.
B)  The compound contains a C=O group.
C)  The compound contains a cyano or alkyne group.
D)  Both (The compound has a molecular mass of 70) and (The compound contains a C=O group) are true statements.
E)  Both (The compound has a molecular mass of 70) and (The compound contains a cyano or alkyne group) are true statements.F) A) and B)
G) A) and C)

Question 6

Stronger bonds will be found where in the infrared spectrum?

Accepted Answer

A)  Higher molecular weight
B)  Lower molecular weight
C)  Lower wavenumbers
D)  Higher wavenumbersE) C) and D)
F) B) and D)

Question 7

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 104 and shows prominent peaks in its IR spectrum at 3200-2850 cm-1?

Accepted Answer

A)  The compound has a molecular mass of 104.
B)  The compound contains a C=O group and Csp3-H hybridized bonds.
C)  The compound contains an OH group and Csp3-H hybridized bonds.
D)  Both (The compound has a molecular mass of 104) and (The compound contains a C=O group and Csp3-H hybridized bonds) are true statements.
E)  Both (The compound has a molecular mass of 104) and (The compound contains an OH group and Csp3-H hybridized bonds) are true statements.F) B) and E)
G) A) and E)

Question 8

Which of the following compounds will have the lowest wavenumber for carbonyl absorption?

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) None of the above
F) A) and D)

Question 9

Ignoring sp3 CH stretching,estimate where the major peak be in the following compound's IR. 3 CH stretching,estimate where the major peak be in the following compound's IR.   A) 3300 cm-1 B) 3100 cm-1 C) 2250 cm-1 D) 1750 cm-1" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  3300 cm-1
B)  3100 cm-1
C)  2250 cm-1
D)  1750 cm-1E) B) and C)
F) A) and D)

Question 10

In an IR spectrum,which of the indicated C-H bonds exhibits a stretching absorption at the largest wave number?

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) None of the above
F) B) and C)

Question 11

When the phenol shown below is treated with KOH,it forms a product whose IR spectrum does not show an absorption in the 3200-3600 cm-1 region.Propose a structure for the product. -1 region.Propose a structure for the product.   A) I B) II C) III D) IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) All of the above
F) None of the above

Question 12

An IR spectrum has the following potentially important absorptions: 3091,3067,2963,2921,2252,1603,1499,1455,1416,1078,1031,941,735,and 696 cm-1.Indicate which structure corresponds to the IR data. -1.Indicate which structure corresponds to the IR data.   A) I B) II C) III D) IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) B) and D)
F) All of the above

Question 13

Ignoring sp3 CH stretching,estimate where the major peak be in the following compound's IR. 3 CH stretching,estimate where the major peak be in the following compound's IR.   A) 3300 cm-1 B) 3100 cm-1 C) 2250 cm-1 D) 1750 cm-1" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  3300 cm-1
B)  3100 cm-1
C)  2250 cm-1
D)  1750 cm-1E) A) and D)
F) B) and C)

Question 14

Which of the indicated C-H bonds absorbs at the lowest wave number in the IR spectrum?

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) None of the above
F) All of the above

Question 15

Ignoring sp3 CH stretching,estimate where the major peak be in the following compound's IR. 3 CH stretching,estimate where the major peak be in the following compound's IR.   A) 3300 cm-1 B) 3100 cm-1 C) 2250 cm-1 D) 1750 cm-1" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  3300 cm-1
B)  3100 cm-1
C)  2250 cm-1
D)  1750 cm-1E) A) and C)
F) None of the above

Question 16

What type of signal(s) would you observe in the mass and (or) infrared spectrum of the following compound? -1" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  A signal at 95 amu
B)  A signal at 94 amu
C)  Two signals at 95 and 94 amu
D)  A signal at 3600-3200 cm-1E) A) and B)
F) None of the above

Question 17

Why does an alkyne carbon-carbon triple bond vibrate at a higher wavenumber than an alkene carbon-carbon double bond?

Accepted Answer

A)  It is stronger.
B)  It is weaker.
C)  It has fewer hydrogens.
D)  It makes a less stable cation.E) A) and B)
F) None of the above

Exam 31: Analyzing Molecular Motion and Infrared Spectroscopy

Which of the following compounds will have the lowest wavenumber for carbonyl absorption?

Correct Answer
verified

Ignoring sp³ CH stretching,estimate where the major peak be in the following compound's IR.

Correct Answer
verified

Ignoring sp³ CH stretching,estimate where the major peak be in the following compound's IR.

Correct Answer
verified

What type(s) of molecular motion is (are) observed using infrared spectroscopy?

Correct Answer
verified

What type of signal(s) would you observe in the mass and (or) infrared spectrum of the following compound?

Correct Answer
verified

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 104 and shows prominent peaks in its IR spectrum at 3200-2850 cm^-1?

Correct Answer
verified

Which of the indicated C-H bonds absorbs at the lowest wave number in the IR spectrum?

Correct Answer
verified

An IR spectrum has the following potentially important absorptions: 3091,3067,2963,2921,2252,1603,1499,1455,1416,1078,1031,941,735,and 696 cm^-1.Indicate which structure corresponds to the IR data.

Correct Answer
verified

What type of signal(s) would you observe in the mass and (or) infrared spectrum of the following compound?

Correct Answer
verified

An alkyne C-H bond absorbs at higher wave number than an alkene C-H bond.What does this tell you about the strength of these two bonds?

Correct Answer
verified

Why does an alkyne carbon-carbon triple bond vibrate at a higher wavenumber than an alkene carbon-carbon double bond?

Correct Answer
verified

Which of the following information is primarily obtained from an IR spectrum?

Correct Answer
verified

When the phenol shown below is treated with KOH,it forms a product whose IR spectrum does not show an absorption in the 3200-3600 cm^-1 region.Propose a structure for the product.

Correct Answer
verified

In an IR spectrum,which of the indicated C-H bonds exhibits a stretching absorption at the largest wave number?

Correct Answer
verified

Ignoring sp³ CH stretching,estimate where the major peak be in the following compound's IR.

Correct Answer
verified

Which of the following statement(s) is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 69 and shows a prominent peak in its IR spectrum at 2250 cm^-1?

Correct Answer
verified

Stronger bonds will be found where in the infrared spectrum?

Correct Answer
verified

Exam 31: Analyzing Molecular Motion and Infrared Spectroscopy

Which of the following compounds will have the lowest wavenumber for carbonyl absorption?

Correct AnswerverifiedShow Answer

Ignoring sp3 CH stretching,estimate where the major peak be in the following compound's IR.

Correct AnswerverifiedShow Answer

Ignoring sp3 CH stretching,estimate where the major peak be in the following compound's IR.

Correct AnswerverifiedShow Answer

What type(s) of molecular motion is (are) observed using infrared spectroscopy?

Correct AnswerverifiedShow Answer

What type of signal(s) would you observe in the mass and (or) infrared spectrum of the following compound?

Correct AnswerverifiedShow Answer

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 104 and shows prominent peaks in its IR spectrum at 3200-2850 cm-1?

Correct AnswerverifiedShow Answer

Which of the indicated C-H bonds absorbs at the lowest wave number in the IR spectrum?

Correct AnswerverifiedShow Answer

An IR spectrum has the following potentially important absorptions: 3091,3067,2963,2921,2252,1603,1499,1455,1416,1078,1031,941,735,and 696 cm-1.Indicate which structure corresponds to the IR data.

Correct AnswerverifiedShow Answer

What type of signal(s) would you observe in the mass and (or) infrared spectrum of the following compound?

Correct AnswerverifiedShow Answer

An alkyne C-H bond absorbs at higher wave number than an alkene C-H bond.What does this tell you about the strength of these two bonds?

Correct AnswerverifiedShow Answer

Why does an alkyne carbon-carbon triple bond vibrate at a higher wavenumber than an alkene carbon-carbon double bond?

Correct AnswerverifiedShow Answer

Which of the following information is primarily obtained from an IR spectrum?

Correct AnswerverifiedShow Answer

When the phenol shown below is treated with KOH,it forms a product whose IR spectrum does not show an absorption in the 3200-3600 cm-1 region.Propose a structure for the product.

Correct AnswerverifiedShow Answer

In an IR spectrum,which of the indicated C-H bonds exhibits a stretching absorption at the largest wave number?

Correct AnswerverifiedShow Answer

Ignoring sp3 CH stretching,estimate where the major peak be in the following compound's IR.

Correct AnswerverifiedShow Answer

Which of the following statement(s) is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 69 and shows a prominent peak in its IR spectrum at 2250 cm-1?

Correct AnswerverifiedShow Answer

Stronger bonds will be found where in the infrared spectrum?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Ignoring sp³ CH stretching,estimate where the major peak be in the following compound's IR.

Correct Answer
verified

Ignoring sp³ CH stretching,estimate where the major peak be in the following compound's IR.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 104 and shows prominent peaks in its IR spectrum at 3200-2850 cm^-1?

Correct Answer
verified

Correct Answer
verified

An IR spectrum has the following potentially important absorptions: 3091,3067,2963,2921,2252,1603,1499,1455,1416,1078,1031,941,735,and 696 cm^-1.Indicate which structure corresponds to the IR data.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

When the phenol shown below is treated with KOH,it forms a product whose IR spectrum does not show an absorption in the 3200-3600 cm^-1 region.Propose a structure for the product.

Correct Answer
verified

Correct Answer
verified

Ignoring sp³ CH stretching,estimate where the major peak be in the following compound's IR.

Correct Answer
verified

Which of the following statement(s) is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 69 and shows a prominent peak in its IR spectrum at 2250 cm^-1?

Correct Answer
verified

Correct Answer
verified