Question 1

Exhibit 12-4
The following question(s) refer to the mass spectrum shown below.  Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/
-Refer to Exhibit 12-4.This compound contains C,H,and one other atom.Identify the other atom from the mass spectrum and explain your reasoning.

Accepted Answer

There are two molecular ions i...

Question 2

Exhibit 12-3
For each compound below,what are the masses of the charged fragments produced by the indicated cleavage pathways?
-Refer to Exhibit 12-3.Alpha cleavage and dehydration of

Accepted Answer

This compound,4-methyl-3-penten-1-ol,has...

Question 3

Which of the following regions of the electromagnetic spectrum would have insufficient energy to produce the following energy transition?

Accepted Answer

A)  radio wave
B)  visible
C)  ultraviolet
D)  X rayE) C) and D)
F) A) and D)

Question 4

Exhibit 12-3
For each compound below,what are the masses of the charged fragments produced by the indicated cleavage pathways?
-Refer to Exhibit 12-3.Alpha cleavage of

Accepted Answer

This compound,phenylacetone,ha...

Question 5

Predict the m/z position of the parent peak,the peak due to dehydration of the alcohol and α-cleavage of the carbonyl in the mass spectrum of the compound shown below.

Accepted Answer

Parent peak: 116
Deh...

Question 6

Exhibit 12-5
Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s).  Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/
-Refer to Exhibit 12-5.Which peak represents the parent peak?

Accepted Answer

The peak at m/z = 72 represents the parent peak or the molecular ion,M⁺.

Question 7

The amount of energy in infrared light corresponds to:

Accepted Answer

A)  the amount of energy needed to promote one electron from a bonding to an antibonding molecular orbital
B)  the amount of energy needed to "flip" the spin of a 13C or 1H nucleus
C)  the amount of energy needed to strip a molecule of one electron to generate a cation radical
D)  the amount of energy needed to increase certain molecular motions,such as bond vibrations,in organic moleculesE) All of the above
F) A) and C)

Question 8

Mass spectrometry and infrared spectroscopy are complementary techniques because:

Accepted Answer

A)  Mass spectrometry provides information about the molar mass and formula while infrared spectroscopy helps identify the functional groups in the formula.
B)  Infrared spectroscopy provides information about the molar mass and formula while mass spectrometry helps identify the functional groups in the formula.
C)  Mass spectrometry provides information about the carbon-hydrogen framework while infrared spectroscopy helps identify the functional groups in the framework.
D)  Infrared spectroscopy provides information about the carbon-hydrogen framework while mass spectrometry helps identify the functional groups in the framework.E) B) and C)
F) All of the above

Question 9

Which of the following regions of the IR spectrum would be significantly different for the following two substances? -1 B) 2850 - 2000 cm-1 C) 2000 - 1500 cm-1 D) 1500 - 400 cm-1" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  4000 - 2850 cm-1
B)  2850 - 2000 cm-1
C)  2000 - 1500 cm-1
D)  1500 - 400 cm-1E) C) and D)
F) A) and D)

Question 10

​Ethyl acetate and 2-butene-1,4-diol both have the molecular formula C4H8O2.How would you use infrared spectroscopy to distinguish between the two?

Accepted Answer

Question 11

Exhibit 12-4
The following question(s) refer to the mass spectrum shown below.  Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/
-Refer to Exhibit 12-4.Propose a structure for this compound.

Accepted Answer

C₆H₅Br contains four degrees of ...

Question 12

​Both methylcycloheptane and ethylcyclohexane have the same molecular mass.Explain how it is possible to distinguish between the two compounds by studying and comparing both their mass spectra.

Accepted Answer

Molecular ions are shown at M⁺=113 in bot...

Question 13

Exhibit 12-2
Use the data below to answer the following question(s) .
Loratidine is the active ingredient in the antihistamine Claritin .Mass spectral analysis of loratidine shows M+ at m/z = 382 and M+ at m/z = 384 in an approximate ratio of 3:1 in intensity.
-Refer to Exhibit 12-2.The mass spectral data indicates that loratidine contains:

Accepted Answer

A)  fluorine
B)  chlorine
C)  bromine
D)  iodineE) A) and C)
F) All of the above B

Question 14

When 2-bromopropane reacts with ethoxide ion,two products are formed;one is the product of SN2 substitution and the other is the product of E2 elimination.Write the structures of both products,and tell how they could be distinguished using IR spectroscopy.

Accepted Answer

Question 15

Exhibit 12-1
Select the most reasonable formula for the compounds with the following mass spectral data.
-Refer to Exhibit 12-1.M+ at m/z = 101 with a minor M+1 peak

Accepted Answer

A)  C5H6Cl
B)  C5H12N2
C)  C6H15N
D)  C9H12OE) B) and C)
F) B) and D) C

Question 16

In which of the following regions of the electromagnetic spectrum is the frequency lower than in the IR region?

Accepted Answer

A)  radio wave
B)  visible
C)  ultraviolet
D)  X rayE) A) and B)
F) A) and C)

Question 17

​What are the charged fragments produced if 4,5-dimethylhex-1-en-3-ol undergoes alpha cleavage?

Accepted Answer

The nominal mass of the compou...

Question 18

Exhibit 12-5
Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s).  Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/
-Refer to Exhibit 12-5.What peak represents M+?

Accepted Answer

The peak a...

Question 19

Exhibit 12-6
MATCH each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur.Place the letter of the region in the blank to the left of the bond-type.
-_____ triple bond stretching vibrations.

Accepted Answer

A)  4000 to 2500 cm−1
B)  2500 to 2000 cm−1
C)  2000 to 1500 cm−1
D)  below 1500 cm−1E) A) and B)
F) A) and C)

Question 20

Exhibit 12-6
MATCH each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur.Place the letter of the region in the blank to the left of the bond-type.
-_____ C=O,C=N,and C=C bond absorptions.

Accepted Answer

A)  4000 to 2500 cm−1
B)  2500 to 2000 cm−1
C)  2000 to 1500 cm−1
D)  below 1500 cm−1E) All of the above
F) B) and D)

Exam 12: Structure Determination: Mass Spectrometry and Infrared Spectroscopy

Exhibit 12-4 The following question(s) refer to the mass spectrum shown below. Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/ -Refer to Exhibit 12-4.This compound contains C,H,and one other atom.Identify the other atom from the mass spectrum and explain your reasoning.

Correct Answer
verified
There are two molecular ions i...
View Answer

Exhibit 12-3 For each compound below,what are the masses of the charged fragments produced by the indicated cleavage pathways? -Refer to Exhibit 12-3.Alpha cleavage and dehydration of

Correct Answer
verified
This compound,4-methyl-3-penten-1-ol,has...
View Answer

Which of the following regions of the electromagnetic spectrum would have insufficient energy to produce the following energy transition?

Correct Answer
verified

Exhibit 12-3 For each compound below,what are the masses of the charged fragments produced by the indicated cleavage pathways? -Refer to Exhibit 12-3.Alpha cleavage of

Correct Answer
verified
This compound,phenylacetone,ha...
View Answer

Predict the m/z position of the parent peak,the peak due to dehydration of the alcohol and α-cleavage of the carbonyl in the mass spectrum of the compound shown below.

Correct Answer
verified
Parent peak: 116
Deh...
View Answer

Exhibit 12-5 Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s). Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/ -Refer to Exhibit 12-5.Which peak represents the parent peak?

Correct Answer
verified
The peak at m/z = 72 represents the parent peak or the molecular ion,M⁺.

The amount of energy in infrared light corresponds to:

Correct Answer
verified

Mass spectrometry and infrared spectroscopy are complementary techniques because:

Correct Answer
verified

Which of the following regions of the IR spectrum would be significantly different for the following two substances?

Correct Answer
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Ethyl acetate and 2-butene-1,4-diol both have the molecular formula C₄H₈O₂.How would you use infrared spectroscopy to distinguish between the two?

Correct Answer
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Exhibit 12-4 The following question(s) refer to the mass spectrum shown below. Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/ -Refer to Exhibit 12-4.Propose a structure for this compound.

Correct Answer
verified
C₆H₅Br contains four degrees of ...
View Answer

Both methylcycloheptane and ethylcyclohexane have the same molecular mass.Explain how it is possible to distinguish between the two compounds by studying and comparing both their mass spectra.

Correct Answer
verified
Molecular ions are shown at M⁺=113 in bot...
View Answer

Correct Answer
verified
B

When 2-bromopropane reacts with ethoxide ion,two products are formed;one is the product of S_N2 substitution and the other is the product of E2 elimination.Write the structures of both products,and tell how they could be distinguished using IR spectroscopy.

Correct Answer
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Exhibit 12-1 Select the most reasonable formula for the compounds with the following mass spectral data. -Refer to Exhibit 12-1.M⁺ at m/z = 101 with a minor M+1 peak

Correct Answer
verified
C

In which of the following regions of the electromagnetic spectrum is the frequency lower than in the IR region?

Correct Answer
verified

What are the charged fragments produced if 4,5-dimethylhex-1-en-3-ol undergoes alpha cleavage?

Correct Answer
verified
The nominal mass of the compou...
View Answer

Exhibit 12-5 Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s). Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/ -Refer to Exhibit 12-5.What peak represents M⁺?

Correct Answer
verified
The peak a...
View Answer

Exhibit 12-6 MATCH each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur.Place the letter of the region in the blank to the left of the bond-type. -_____ triple bond stretching vibrations.

Correct Answer
verified

Exhibit 12-6 MATCH each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur.Place the letter of the region in the blank to the left of the bond-type. -_____ C=O,C=N,and C=C bond absorptions.

Correct Answer
verified

Exam 12: Structure Determination: Mass Spectrometry and Infrared Spectroscopy

Exhibit 12-4 The following question(s) refer to the mass spectrum shown below. Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/ -Refer to Exhibit 12-4.This compound contains C,H,and one other atom.Identify the other atom from the mass spectrum and explain your reasoning.

Correct AnswerverifiedThere are two molecular ions i...View AnswerShow Answer

Exhibit 12-3 For each compound below,what are the masses of the charged fragments produced by the indicated cleavage pathways? -Refer to Exhibit 12-3.Alpha cleavage and dehydration of

Correct AnswerverifiedThis compound,4-methyl-3-penten-1-ol,has...View AnswerShow Answer

Which of the following regions of the electromagnetic spectrum would have insufficient energy to produce the following energy transition?

Correct AnswerverifiedShow Answer

Exhibit 12-3 For each compound below,what are the masses of the charged fragments produced by the indicated cleavage pathways? -Refer to Exhibit 12-3.Alpha cleavage of

Correct AnswerverifiedThis compound,phenylacetone,ha...View AnswerShow Answer

Predict the m/z position of the parent peak,the peak due to dehydration of the alcohol and α-cleavage of the carbonyl in the mass spectrum of the compound shown below.

Correct AnswerverifiedParent peak: 116Deh...View AnswerShow Answer

Exhibit 12-5 Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s). Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/ -Refer to Exhibit 12-5.Which peak represents the parent peak?

Correct AnswerverifiedThe peak at m/z = 72 represents the parent peak or the molecular ion,M+.

The amount of energy in infrared light corresponds to:

Correct AnswerverifiedShow Answer

Mass spectrometry and infrared spectroscopy are complementary techniques because:

Correct AnswerverifiedShow Answer

Which of the following regions of the IR spectrum would be significantly different for the following two substances?

Correct AnswerverifiedShow Answer

​Ethyl acetate and 2-butene-1,4-diol both have the molecular formula C4H8O2.How would you use infrared spectroscopy to distinguish between the two?

Correct AnswerverifiedShow Answer

Exhibit 12-4 The following question(s) refer to the mass spectrum shown below. Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/ -Refer to Exhibit 12-4.Propose a structure for this compound.

Correct AnswerverifiedC6H5Br contains four degrees of ...View AnswerShow Answer

​Both methylcycloheptane and ethylcyclohexane have the same molecular mass.Explain how it is possible to distinguish between the two compounds by studying and comparing both their mass spectra.

Correct AnswerverifiedMolecular ions are shown at M+=113 in bot...View AnswerShow Answer

Correct AnswerverifiedB

When 2-bromopropane reacts with ethoxide ion,two products are formed;one is the product of SN2 substitution and the other is the product of E2 elimination.Write the structures of both products,and tell how they could be distinguished using IR spectroscopy.

Correct AnswerverifiedShow Answer

Exhibit 12-1 Select the most reasonable formula for the compounds with the following mass spectral data. -Refer to Exhibit 12-1.M+ at m/z = 101 with a minor M+1 peak

Correct AnswerverifiedC

In which of the following regions of the electromagnetic spectrum is the frequency lower than in the IR region?

Correct AnswerverifiedShow Answer

​What are the charged fragments produced if 4,5-dimethylhex-1-en-3-ol undergoes alpha cleavage?

Correct AnswerverifiedThe nominal mass of the compou...View AnswerShow Answer

Exhibit 12-5 Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s). Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/ -Refer to Exhibit 12-5.What peak represents M+?

Correct AnswerverifiedThe peak a...View AnswerShow Answer

Exhibit 12-6 MATCH each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur.Place the letter of the region in the blank to the left of the bond-type. -_____ triple bond stretching vibrations.

Correct AnswerverifiedShow Answer

Exhibit 12-6 MATCH each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur.Place the letter of the region in the blank to the left of the bond-type. -_____ C=O,C=N,and C=C bond absorptions.

Correct AnswerverifiedShow Answer

Correct Answer
verified
There are two molecular ions i...
View Answer

Correct Answer
verified
This compound,4-methyl-3-penten-1-ol,has...
View Answer

Correct Answer
verified

Correct Answer
verified
This compound,phenylacetone,ha...
View Answer

Correct Answer
verified
Parent peak: 116
Deh...
View Answer

Correct Answer
verified
The peak at m/z = 72 represents the parent peak or the molecular ion,M⁺.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Ethyl acetate and 2-butene-1,4-diol both have the molecular formula C₄H₈O₂.How would you use infrared spectroscopy to distinguish between the two?

Correct Answer
verified

Correct Answer
verified
C₆H₅Br contains four degrees of ...
View Answer

Both methylcycloheptane and ethylcyclohexane have the same molecular mass.Explain how it is possible to distinguish between the two compounds by studying and comparing both their mass spectra.

Correct Answer
verified
Molecular ions are shown at M⁺=113 in bot...
View Answer

Correct Answer
verified
B

When 2-bromopropane reacts with ethoxide ion,two products are formed;one is the product of S_N2 substitution and the other is the product of E2 elimination.Write the structures of both products,and tell how they could be distinguished using IR spectroscopy.

Correct Answer
verified

Exhibit 12-1 Select the most reasonable formula for the compounds with the following mass spectral data. -Refer to Exhibit 12-1.M⁺ at m/z = 101 with a minor M+1 peak

Correct Answer
verified
C

Correct Answer
verified

What are the charged fragments produced if 4,5-dimethylhex-1-en-3-ol undergoes alpha cleavage?

Correct Answer
verified
The nominal mass of the compou...
View Answer

Exhibit 12-5 Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s). Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/ -Refer to Exhibit 12-5.What peak represents M⁺?

Correct Answer
verified
The peak a...
View Answer

Correct Answer
verified

Correct Answer
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