Question 1

Which of the following is not true about the molecular ion in mass spectrometry?

Accepted Answer

A)   The molecular ion is produced by loss of one electron from the molecule.
B)   The mass of the molecular ion is equivalent to the mass of the molecule.
C)   The ion is produced by a loss of pair of electrons from the molecule.
D)   The molecular ion is often unstable and can undergo fragmentation.

Question 2

For each of the following IR spectra determine if it is consistent with the structure of an alcohol, a ketone, an aldehyde, a carboxylic acid, a primary amine, a secondary amine, a primary amide, or a secondary amide.  I.
SDBS: National Institute of Advanced Industrial Science and Technology
II.

Accepted Answer

I: seconda...

Question 3

Which molecular formula is consistent with the following mass spectral data? M+• at m/z = 78, relative height = 23.5%
(M+1) +• at m/z = 79, relative height = 0.78%
(M+2) +• at m/z = 80, relative height = 7.5%

Accepted Answer

A)   C6H6
B)   C3H7Cl
C)   C6H8
D)   C6H9Cl
E)   none of these

Question 4

For the following reaction, which of the following change(s)  in the IR spectrum is consistent with conversion of the reactant to the product? -1 should disappear B)  absorption at 3200-3400 cm-1 and 1720cm-1 should appear C)  absorption at 2250 cm-1 should disappear, new absorptions at 2600-2800 cm-1 and 1720 cm-1 should appear. D)  absorption at 2250 cm-1 should disappear, a new absorption around 3400 cm-1 should appear. E)  none of these" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   absorption at 2250 cm-1 should disappear
B)   absorption at 3200-3400 cm-1 and 1720cm-1 should appear
C)   absorption at 2250 cm-1 should disappear, new absorptions at 2600-2800 cm-1 and 1720 cm-1 should appear.
D)   absorption at 2250 cm-1 should disappear, a new absorption around 3400 cm-1 should appear.
E)   none of these

Question 5

Provide a molecular formula that is consistent with the following mass spectral data.
M+• at m/z = 73, relative height = 86.1%
(M+1)+• at m/z = 74, relative height = 3.2%

Accepted Answer

Question 6

Which of the following compounds will show a broad absorption near 3300 cm-1 and a sharp absorption at 1650 cm-1? -1 and a sharp absorption at 1650 cm-1?   A)  I B)  II C)  III D)  IV E)  V" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   V

Question 7

Which of the following information is primarily obtained from infrared spectroscopy?

Accepted Answer

A)   arrangement of carbon and hydrogen atoms in a compound
B)   molecular weight of a compound
C)   any conjugated π system present in a compound
D)   functional groups present in a compound
E)   all of these

Question 8

Which of the following is not a prominent peak in the mass spectrum of 2-methyl-2-pentanol?

Accepted Answer

A)   (M-15) 
B)   (M-18) 
C)   (M-29) 
D)   (M-16) 
E)   none of these

Question 9

Which of the following mass spectra shows the presence of chlorine in a compound? I  II  III  IV  Four spectra above: courtesy of SDBS: National Institute of Advanced Industrial Science and Technology

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   none of these

Question 10

Define retention time.

Accepted Answer

A)   the amount of time that the substance takes to boil
B)   the amount of time that the substance takes to melt
C)   the amount of time required to exit from the mass spectrometer
D)   the amount of time required to exit from the gas chromatograph
E)   the amount of time required to set up the GC-MS

Question 11

Which one of the following compounds is consistent with the mass spectrum below? 3CH2CH(CH3) 2 B)  CH3CHOHCH2CH3 C)  CH3CH2OCH2CH3 D)  CH3CH2NHCH2CH3 E)  CH3CH2CH2CH3" class="answers-bank-image d-inline" rel="preload" > SDBS: National Institute of Advanced Industrial Science and Technology

Accepted Answer

A)   CH3CH2CH(CH3) 2
B)   CH3CHOHCH2CH3
C)   CH3CH2OCH2CH3
D)   CH3CH2NHCH2CH3
E)   CH3CH2CH2CH3

Question 12

Identify the medical application that does not use mass spectrometry.

Accepted Answer

A)   cancer detection
B)   metabolic defects in babies
C)   pathogenic bacteria
D)   drug analysis
E)   all of these applications use mass spectrometry

Question 13

Which of the following is true about the molecular weight and the M+•-m/z value for the following compound? +•-m/z value for the following compound?   A)  odd molecular weight, m/z = 115 B)  odd molecular weight, m/z = 121 C)  even molecular weight, m/z = 96 D)  even molecular weight, m/z = 132 E)  even molecular weight, m/z = 116" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   odd molecular weight, m/z = 115
B)   odd molecular weight, m/z = 121
C)   even molecular weight, m/z = 96
D)   even molecular weight, m/z = 132
E)   even molecular weight, m/z = 116

Question 14

Which of the following is true about the IR spectrum of the compound shown below? -1 and 2150 cm-1 B)  absorptions at 1800 cm-1 and 2150 cm-1 C)  absorptions at 1720 cm-1 and 2250 cm-1 D)  absorptions at 1800 cm-1 and 2250 cm-1 E)  absorptions at 1650 cm-1 and 2150 cm-1" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   absorptions at 1720 cm-1 and 2150 cm-1
B)   absorptions at 1800 cm-1 and 2150 cm-1
C)   absorptions at 1720 cm-1 and 2250 cm-1
D)   absorptions at 1800 cm-1 and 2250 cm-1
E)   absorptions at 1650 cm-1 and 2150 cm-1

Question 15

Predict the product for the following reaction and explain how you can use IR spectroscopy to monitor the progress of the reaction.

Accepted Answer

<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30">_TB4454_00 Absorptions for C=O...

Question 16

Which of the following is initially produced when a compound is bombarded with high energy electrons?

Accepted Answer

A)   anions
B)   free radicals
C)   radical cations
D)   cations
E)   isotopes

Question 17

Rank absorption of the indicated bonds in decreasing (highest to lowest)  order of wavenumber.  II > I B)  I > II > III C)  II > I > III D)  III > I > II E)  II > III > I" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   III > II > I
B)   I > II > III
C)   II > I > III
D)   III > I > II
E)   II > III > I

Question 18

Which of the following mass spectra shows the presence of bromine in a compound? I  II  III  IV  Four spectra above: courtesy of SDBS: National Institute of Advanced Industrial Science and Technology

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   none of these

Question 19

Why does bromine produces M+• and (M+2) +• peaks of equal intensity on a mass spectrum?

Accepted Answer

A)   ADVANCE \u 281 ADVANCE \d 2Br isotope has higher natural abundance than ADVANCE \u 279 ADVANCE \d 2Br isotope
B)   ADVANCE \u 279 ADVANCE \d 2Br and ADVANCE \u 281 ADVANCE \d 2Br isotopes have almost equal natural abundance
C)   ADVANCE \u 279 ADVANCE \d 2Br isotope has higher natural abundance than ADVANCE \u 281 ADVANCE \d 2Br isotope
D)   none of these

Question 20

Carboxylic acids show a very broad absorption for the OH group compared to alcohols, because they can form a ______.

Accepted Answer

A)   dimer
B)   polymer
C)   trimer
D)   tetramer

Exam 14: Infrared Spectroscopy and Mass Spectrometry

Which of the following compounds will show a broad absorption near 3300 cm-1 and a sharp absorption at 1650 cm-1?

Correct AnswerverifiedShow Answer

Which of the following is true about the IR spectrum of the compound shown below?

Correct AnswerverifiedShow Answer

Which of the following information is primarily obtained from infrared spectroscopy?

Correct AnswerverifiedShow Answer

For each of the following IR spectra determine if it is consistent with the structure of an alcohol, a ketone, an aldehyde, a carboxylic acid, a primary amine, a secondary amine, a primary amide, or a secondary amide. I. SDBS: National Institute of Advanced Industrial Science and Technology II.

Correct AnswerverifiedI: seconda...View AnswerShow Answer

For the following reaction, which of the following change(s) in the IR spectrum is consistent with conversion of the reactant to the product?

Correct AnswerverifiedShow Answer

Which of the following mass spectra shows the presence of bromine in a compound? I II III IV Four spectra above: courtesy of SDBS: National Institute of Advanced Industrial Science and Technology

Correct AnswerverifiedShow Answer

Which of the following is true about the molecular weight and the M+•-m/z value for the following compound?

Correct AnswerverifiedShow Answer

Which of the following is initially produced when a compound is bombarded with high energy electrons?

Correct AnswerverifiedShow Answer

Define retention time.

Correct AnswerverifiedShow Answer

Carboxylic acids show a very broad absorption for the OH group compared to alcohols, because they can form a ______.

Correct AnswerverifiedShow Answer

Why does bromine produces M+• and (M+2) +• peaks of equal intensity on a mass spectrum?

Correct AnswerverifiedShow Answer

Rank absorption of the indicated bonds in decreasing (highest to lowest) order of wavenumber.

Correct AnswerverifiedShow Answer

Which one of the following compounds is consistent with the mass spectrum below? SDBS: National Institute of Advanced Industrial Science and Technology

Correct AnswerverifiedShow Answer

Which molecular formula is consistent with the following mass spectral data? M+• at m/z = 78, relative height = 23.5% (M+1) +• at m/z = 79, relative height = 0.78% (M+2) +• at m/z = 80, relative height = 7.5%

Correct AnswerverifiedShow Answer

Which of the following is not a prominent peak in the mass spectrum of 2-methyl-2-pentanol?

Correct AnswerverifiedShow Answer

Which of the following is not true about the molecular ion in mass spectrometry?

Correct AnswerverifiedShow Answer

Predict the product for the following reaction and explain how you can use IR spectroscopy to monitor the progress of the reaction.

Correct Answerverified_TB4454_00 Absorptions for C=O...View AnswerShow Answer

Which of the following mass spectra shows the presence of chlorine in a compound? I II III IV Four spectra above: courtesy of SDBS: National Institute of Advanced Industrial Science and Technology

Correct AnswerverifiedShow Answer

Identify the medical application that does not use mass spectrometry.

Correct AnswerverifiedShow Answer

Provide a molecular formula that is consistent with the following mass spectral data. M+• at m/z = 73, relative height = 86.1% (M+1)+• at m/z = 74, relative height = 3.2%

Correct AnswerverifiedShow Answer

Which of the following compounds will show a broad absorption near 3300 cm^-1 and a sharp absorption at 1650 cm^-1?

Correct Answer
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I: seconda...
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Which of the following is true about the molecular weight and the M⁺•-m/z value for the following compound?

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Why does bromine produces M⁺• and (M+2) ⁺• peaks of equal intensity on a mass spectrum?

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Which molecular formula is consistent with the following mass spectral data? M⁺•at m/z = 78, relative height = 23.5% (M+1) ⁺•at m/z = 79, relative height = 0.78% (M+2) ⁺•at m/z = 80, relative height = 7.5%

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_TB4454_00 Absorptions for C=O...
View Answer

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Provide a molecular formula that is consistent with the following mass spectral data. M⁺•at m/z = 73, relative height = 86.1% (M+1)⁺•at m/z = 74, relative height = 3.2%

Correct Answer
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