Question 1

Which of the following structures is consistent with a compound that displays a molecular ion peak at 84 and infrared signals at 3000-2850 cm-1 and no signals between 3000-3300 cm-1? -1 and no signals between 3000-3300 cm-1?   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) A) and B)
F) A) and C)

Question 2

Examine the IR below and classify the compound.

Accepted Answer

A)  Alkane
B)  Carboxylic acid
C)  Alcohol
D)  AlkeneE) All of the above
F) A) and D)

Question 3

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) B) and C)

Question 4

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 D)
F) B) and D)

Question 5

The functional group region of an infrared spectrum is

Accepted Answer

A)  where the cations appear.
B)  greater than or equal to 1500 cm-1.
C)  less than 1500 cm-1.
D)  greater than or equal to 2500 cm-1.E) A) and D)
F) A) and C)

Question 6

Which of the following structures is consistent with a compound that displays a molecular ion peak at 103 and infrared signals at 2250 and 1600 cm-1? -1?   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 A

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 94 and shows prominent peaks in its IR spectrum at 3600-3200 and 1600 cm-1?

Accepted Answer

A)  The compound has a molecular mass of 94.
B)  The compound contains a C=O group and Csp3-H hybridized bonds.
C)  The compound contains an OH group and a benzene ring.
D)  Both (The compound has a molecular mass of 94) 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 94) and (The compound contains an OH group and a benzene ring) are true statements.F) A) and C)
G) C) and E) E

Question 8

Which of the following π bonds is IR inactive?

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) C) and D)
F) A) and B)

Question 9

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) B) and D)
F) All of the above

Question 10

Examine the IR below and classify the compound.

Accepted Answer

A)  Alcohol
B)  Aldehyde
C)  Amine
D)  Ketone
E)  Carboxylic acidF) C) and D)
G) A) and B)

Question 11

The base peak in a mass spectrum corresponds to the most stable fragment.Propose a structure for a compound that is consistent with the following data. 
a.The molecular ion peak has m/z = 116.
b.The base peak is at m/z = 59.
c.The compound is composed of C,H and O atoms.
d.The IR spectrum shows a strong absorbance at 3257 cm-1. -1.   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) None of the above
F) A) and B)

Question 12

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) A) and B)
F) None of the above

Question 13

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) A) and B)
F) None of the above

Question 14

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) B) and E)
G) A) and C)

Question 15

Examine the IR below and classify the compound.

Accepted Answer

A)  Alcohol
B)  Aldehyde
C)  Amine
D)  KetoneE) B) and D)
F) B) and C)

Question 16

A compound X shows a molecular ion peak at m/z 72 in its mass spectrum,and a strong peak at ~1715 cm-1 in its IR spectrum.Which structures are possible for compound X? -1 in its IR spectrum.Which structures are possible for compound X?   A) I B) II C) III D) I and II" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  I
B)  II
C)  III
D)  I and IIE) B) and C)
F) A) and B) A

Question 17

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) C) and D)
F) All of the above

Question 18

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) A) and C)

Question 19

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) None of the above
F) A) and C)

Question 20

-Which of the following statements is (are) true about the IR spectrum of the compound drawn below? -1 and 1720 cm-1. B) It shows absorptions at 3000-2850 cm-1 and 2150 cm-1. C) It shows absorptions at 2250 cm-1 and 1650 cm-1. D) It shows absorptions at 2250 cm-1 and 1720 cm-1. E) Both statements (It shows absorptions at 3000-2850 cm-1 and 2250 cm-1) and (It shows absorptions at 2250 cm-1 and 1720 cm-1) are true." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  It shows absorptions at 3000-3150 cm-1 and 1720 cm-1.
B)  It shows absorptions at 3000-2850 cm-1 and 2150 cm-1.
C)  It shows absorptions at 2250 cm-1 and 1650 cm-1.
D)  It shows absorptions at 2250 cm-1 and 1720 cm-1.
E)  Both statements (It shows absorptions at 3000-2850 cm-1 and 2250 cm-1) and (It shows absorptions at 2250 cm-1 and 1720 cm-1) are true.F) A) and B)
G) B) and E)

Exam 31: Spectroscopy B: Infrared Spectroscopy

Which of the following structures is consistent with a compound that displays a molecular ion peak at 84 and infrared signals at 3000-2850 cm^-1 and no signals between 3000-3300 cm^-1?

Correct Answer
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Examine the IR below and classify the compound.

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

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

Correct Answer
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The functional group region of an infrared spectrum is

Correct Answer
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Which of the following structures is consistent with a compound that displays a molecular ion peak at 103 and infrared signals at 2250 and 1600 cm^-1?

Correct Answer
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A

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 94 and shows prominent peaks in its IR spectrum at 3600-3200 and 1600 cm^-1?

Correct Answer
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E

Which of the following π bonds is IR inactive?

Correct Answer
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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
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Examine the IR below and classify the compound.

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

Correct Answer
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Stronger bonds will be found where in the infrared spectrum?

Correct Answer
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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
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Examine the IR below and classify the compound.

Correct Answer
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A compound X shows a molecular ion peak at m/z 72 in its mass spectrum,and a strong peak at ~1715 cm^-1 in its IR spectrum.Which structures are possible for compound X?

Correct Answer
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A

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

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

Correct Answer
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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
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-Which of the following statements is (are) true about the IR spectrum of the compound drawn below?

Correct Answer
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Exam 31: Spectroscopy B: Infrared Spectroscopy

Which of the following structures is consistent with a compound that displays a molecular ion peak at 84 and infrared signals at 3000-2850 cm-1 and no signals between 3000-3300 cm-1?

Correct AnswerverifiedShow Answer

Examine the IR below and classify the compound.

Correct AnswerverifiedShow Answer

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

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

The functional group region of an infrared spectrum is

Correct AnswerverifiedShow Answer

Which of the following structures is consistent with a compound that displays a molecular ion peak at 103 and infrared signals at 2250 and 1600 cm-1?

Correct AnswerverifiedA

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 94 and shows prominent peaks in its IR spectrum at 3600-3200 and 1600 cm-1?

Correct AnswerverifiedE

Which of the following π bonds is IR inactive?

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

Examine the IR below and classify the compound.

Correct AnswerverifiedShow Answer

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

Stronger bonds will be found where in the infrared spectrum?

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

Examine the IR below and classify the compound.

Correct AnswerverifiedShow Answer

A compound X shows a molecular ion peak at m/z 72 in its mass spectrum,and a strong peak at ~1715 cm-1 in its IR spectrum.Which structures are possible for compound X?

Correct AnswerverifiedA

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

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

-Which of the following statements is (are) true about the IR spectrum of the compound drawn below?

Correct AnswerverifiedShow Answer

Which of the following structures is consistent with a compound that displays a molecular ion peak at 84 and infrared signals at 3000-2850 cm^-1 and no signals between 3000-3300 cm^-1?

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

Correct Answer
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Correct Answer
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Correct Answer
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Which of the following structures is consistent with a compound that displays a molecular ion peak at 103 and infrared signals at 2250 and 1600 cm^-1?

Correct Answer
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A

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 94 and shows prominent peaks in its IR spectrum at 3600-3200 and 1600 cm^-1?

Correct Answer
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E

Correct Answer
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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
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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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
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Correct Answer
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A compound X shows a molecular ion peak at m/z 72 in its mass spectrum,and a strong peak at ~1715 cm^-1 in its IR spectrum.Which structures are possible for compound X?

Correct Answer
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A

Correct Answer
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