Question 1

Which of the following compounds gives a 1H NMR spectrum consisting of only two singlets?

Accepted Answer

A)   CH3OCH2CH2OCH2CH3
B)   CH3OCH2CH2CH2CH2OH
C)   CH3OC(CH3) 2OCH3
D)   CH3OCH2CH(CH3) OCH3E) All of the above
F) A) and D) C

Question 2

Examining the infrared spectrum of a compound allows us to:

Accepted Answer

A)   determine the types of functional groups present in the compound
B)   determine the carbon-hydrogen framework of the compound
C)   determine the molecular weight of the compound
D)   determine the nature of the conjugated pi electron system in the compoundE) None of the above
F) A) and B)

Question 3

Instructions: Predict the splitting patterns you would expect for each proton in the molecules below:
Predict:

Accepted Answer

The answer of Instructions: Predict the splitting patterns you would...

Question 4

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm-1 (strong, broad peak)  and 1640 cm-1 (sharp, weak peak) ?

Accepted Answer

A)   -1 (strong, broad peak)  and 1640 cm-1 (sharp, weak peak) ? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
B)   -1 (strong, broad peak)  and 1640 cm-1 (sharp, weak peak) ? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
C)   -1 (strong, broad peak)  and 1640 cm-1 (sharp, weak peak) ? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
D)   -1 (strong, broad peak)  and 1640 cm-1 (sharp, weak peak) ? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >E) B) and C)
F) A) and C)

Question 5

Which feature in the 1H NMR spectrum provides information about the relative numbers of hydrogen atoms of each type found in a compound?

Accepted Answer

A)   number of signals
B)   integration of signals
C)   splitting of signals
D)   chemical shiftE) All of the above
F) A) and B)

Question 6

Which feature in the 1H NMR spectrum provides information about the electronic environment of the protons in a compound?

Accepted Answer

A)   number of signals
B)   integration of signals
C)   splitting of signals
D)   chemical shiftE) All of the above
F) A) and B) D

Question 7

Instructions: The following questions pertain to the charting of NMR spectra. MATCH a term to each description below. Place the letter of the term in the blank to the left of the description.
-Refer to instructions. __________ The NMR charts are calibrated using an arbitrary scale that is divided into __________ units.

Accepted Answer

A)  	TMS
B)  	high-field or upfield side
C)  	MHz
D)  	delta d
E)  	low-field or downfield sideF) 	chemical shiftG) 	specific absorption	H) C) and G)
I) F) and G)

Question 8

Instructions: Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur.

Accepted Answer

The answer of Instructions: Match each of the following groups...

Question 9

Instructions: The following questions pertain to the charting of NMR spectra. MATCH a term to each description below. Place the letter of the term in the blank to the left of the description.
-Refer to instructions. __________ When looking at an NMR chart the right-hand part of the chart is the __________.

Accepted Answer

A)  	TMS
B)  	high-field or upfield side
C)  	MHz
D)  	delta d
E)  	low-field or downfield sideF) 	chemical shiftG) 	specific absorption	H) All of the above
I) B) and F)

Question 10

Instructions: 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 instructions. What peak represents M+?

Accepted Answer

The peak a...

Question 11

Which of the following bonds undergoes stretching at the highest frequency?

Accepted Answer

A)   C=O
B)   C-O
C)   C=C
D)   C-CE) A) and C)
F) A) and B) A

Question 12

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 fragment a molecule
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 B)

Question 13

Which of the following would produce only singlets in an 1H NMR spectrum? 1H NMR spectrum?   A)  A B)  B C)  C D)  D E)  all of these produce only singlets" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   all of these produce only singletsF) A) and B)
G) None of the above

Question 14

When an organic molecule is irradiated with ultraviolet radiation, the energy absorbed by the molecule corresponds to:
 a.	the amount necessary to increase molecular motions in functional groups
b.	the amount necessary to excite electrons from one molecular orbital to another
c.	the amount necessary to "flip" the spin of atomic nuclei
d.	the amount necessary to strip a molecule of one electron to generate a radical cation

Accepted Answer

The answer of When an organic molecule is irradiated with...

Question 15

Which of the following regions in the electromagnetic spectrum corresponds to the radiation with the highest energy?

Accepted Answer

A)   radio waves
B)   ultraviolet
C)   infrared
D)   visibleE) All of the above
F) B) and C)

Question 16

Instructions: 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 instructions. What peak represents the base peak?

Accepted Answer

The peak a...

Question 17

Assume you are carrying out the conversion of 1-bromobutane to butan-1-ol. How could you use IR spectroscopy to determine when the reaction is complete?

Accepted Answer

The infrared spectrum of the starting br...

Question 18

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm-1 (sharp peak)  and 2150 cm-1 (sharp peak) ?

Accepted Answer

A)    CH3CH2C≡CH\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { C } \equiv \mathrm { CH }CH3​CH2​C≡CH 
B)    CH3C≡CCH3\mathrm { CH } _ { 3 } \mathrm { C } \equiv \mathrm { CCH } _ { 3 }CH3​C≡CCH3​ 
C)   -1 (sharp peak)  and 2150 cm-1 (sharp peak) ? 
A)    \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { C } \equiv \mathrm { CH }  
B)    \mathrm { CH } _ { 3 } \mathrm { C } \equiv \mathrm { CCH } _ { 3 }  
C)     
D)     " class="answers-bank-image d-inline" rel="preload" >
D)   -1 (sharp peak)  and 2150 cm-1 (sharp peak) ? 
A)    \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { C } \equiv \mathrm { CH }  
B)    \mathrm { CH } _ { 3 } \mathrm { C } \equiv \mathrm { CCH } _ { 3 }  
C)     
D)     " class="answers-bank-image d-inline" rel="preload" > E) A) and B)
F) A) and C)

Question 19

Instructions: For each of the compounds below tell how many signals you would expect the molecule to have in its normal, broadband decoupled 13C NMR spectra.
Number of signals:

Accepted Answer

Question 20

Instructions: Answer the following question(s) for the compound whose 1H NMR spectra is shown below.
C4H8O  (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/)
Refer to instructions. Describe each signal in terms of its integration, splitting and chemical shift.

Accepted Answer

The signals at 1.05 and 2.45 d are chara...

Exam 13: Structure Determination

Which of the following compounds gives a ¹H NMR spectrum consisting of only two singlets?

Correct Answer
verified
C

Examining the infrared spectrum of a compound allows us to:

Correct Answer
verified

Instructions: Predict the splitting patterns you would expect for each proton in the molecules below: Predict:

Correct Answer
verified

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm^-1 (strong, broad peak) and 1640 cm^-1 (sharp, weak peak) ?

Correct Answer
verified

Which feature in the ¹H NMR spectrum provides information about the relative numbers of hydrogen atoms of each type found in a compound?

Correct Answer
verified

Which feature in the ¹H NMR spectrum provides information about the electronic environment of the protons in a compound?

Correct Answer
verified
D

Instructions: The following questions pertain to the charting of NMR spectra. MATCH a term to each description below. Place the letter of the term in the blank to the left of the description. -Refer to instructions. The NMR charts are calibrated using an arbitrary scale that is divided into units.

Correct Answer
verified

Instructions: Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur.

Correct Answer
verified

Instructions: The following questions pertain to the charting of NMR spectra. MATCH a term to each description below. Place the letter of the term in the blank to the left of the description. -Refer to instructions. When looking at an NMR chart the right-hand part of the chart is the .

Correct Answer
verified

Instructions: 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 instructions. What peak represents M⁺?

Correct Answer
verified
The peak a...
View Answer

Which of the following bonds undergoes stretching at the highest frequency?

Correct Answer
verified
A

The amount of energy in infrared light corresponds to:

Correct Answer
verified

Which of the following would produce only singlets in an ¹H NMR spectrum?

Correct Answer
verified

Correct Answer
verified

Which of the following regions in the electromagnetic spectrum corresponds to the radiation with the highest energy?

Correct Answer
verified

Instructions: 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 instructions. What peak represents the base peak?

Correct Answer
verified
The peak a...
View Answer

Assume you are carrying out the conversion of 1-bromobutane to butan-1-ol. How could you use IR spectroscopy to determine when the reaction is complete?

Correct Answer
verified
The infrared spectrum of the starting br...
View Answer

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm^-1 (sharp peak) and 2150 cm^-1 (sharp peak) ?

Correct Answer
verified

Instructions: For each of the compounds below tell how many signals you would expect the molecule to have in its normal, broadband decoupled ¹³C NMR spectra. Number of signals:

Correct Answer
verified

Instructions: Answer the following question(s) for the compound whose ¹H NMR spectra is shown below. C₄H₈O (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/) Refer to instructions. Describe each signal in terms of its integration, splitting and chemical shift.

Correct Answer
verified
The signals at 1.05 and 2.45 d are chara...
View Answer

Exam 13: Structure Determination

Which of the following compounds gives a 1H NMR spectrum consisting of only two singlets?

Correct AnswerverifiedC

Examining the infrared spectrum of a compound allows us to:

Correct AnswerverifiedShow Answer

Instructions: Predict the splitting patterns you would expect for each proton in the molecules below: Predict:

Correct AnswerverifiedShow Answer

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm-1 (strong, broad peak) and 1640 cm-1 (sharp, weak peak) ?

Correct AnswerverifiedShow Answer

Which feature in the 1H NMR spectrum provides information about the relative numbers of hydrogen atoms of each type found in a compound?

Correct AnswerverifiedShow Answer

Which feature in the 1H NMR spectrum provides information about the electronic environment of the protons in a compound?

Correct AnswerverifiedD

Correct AnswerverifiedShow Answer

Instructions: Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Instructions: 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 instructions. What peak represents M+?

Correct AnswerverifiedThe peak a...View AnswerShow Answer

Which of the following bonds undergoes stretching at the highest frequency?

Correct AnswerverifiedA

The amount of energy in infrared light corresponds to:

Correct AnswerverifiedShow Answer

Which of the following would produce only singlets in an 1H NMR spectrum?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following regions in the electromagnetic spectrum corresponds to the radiation with the highest energy?

Correct AnswerverifiedShow Answer

Instructions: 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 instructions. What peak represents the base peak?

Correct AnswerverifiedThe peak a...View AnswerShow Answer

Assume you are carrying out the conversion of 1-bromobutane to butan-1-ol. How could you use IR spectroscopy to determine when the reaction is complete?

Correct AnswerverifiedThe infrared spectrum of the starting br...View AnswerShow Answer

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm-1 (sharp peak) and 2150 cm-1 (sharp peak) ?

Correct AnswerverifiedShow Answer

Instructions: For each of the compounds below tell how many signals you would expect the molecule to have in its normal, broadband decoupled 13C NMR spectra. Number of signals:

Correct AnswerverifiedShow Answer

Instructions: Answer the following question(s) for the compound whose 1H NMR spectra is shown below. C4H8O (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/) Refer to instructions. Describe each signal in terms of its integration, splitting and chemical shift.

Correct AnswerverifiedThe signals at 1.05 and 2.45 d are chara...View AnswerShow Answer

Which of the following compounds gives a ¹H NMR spectrum consisting of only two singlets?

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm^-1 (strong, broad peak) and 1640 cm^-1 (sharp, weak peak) ?

Correct Answer
verified

Which feature in the ¹H NMR spectrum provides information about the relative numbers of hydrogen atoms of each type found in a compound?

Correct Answer
verified

Which feature in the ¹H NMR spectrum provides information about the electronic environment of the protons in a compound?

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Instructions: 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 instructions. What peak represents M⁺?

Correct Answer
verified
The peak a...
View Answer

Correct Answer
verified
A

Correct Answer
verified

Which of the following would produce only singlets in an ¹H NMR spectrum?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The peak a...
View Answer

Correct Answer
verified
The infrared spectrum of the starting br...
View Answer

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm^-1 (sharp peak) and 2150 cm^-1 (sharp peak) ?

Correct Answer
verified

Instructions: For each of the compounds below tell how many signals you would expect the molecule to have in its normal, broadband decoupled ¹³C NMR spectra. Number of signals:

Correct Answer
verified

Instructions: Answer the following question(s) for the compound whose ¹H NMR spectra is shown below. C₄H₈O (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/) Refer to instructions. Describe each signal in terms of its integration, splitting and chemical shift.

Correct Answer
verified
The signals at 1.05 and 2.45 d are chara...
View Answer