Question 1

Instructions: For each of the compounds below tell how many signals you would expect the molecule to have in its normal,broadband decoupled S1U1P113S1S1P0C NMR spectra.

-Number of signals:

Accepted Answer

The answer of Instructions: For each of the compounds below...

Question 2

A compound with the molecular formula C5H12O produces only two singlets in the 1H NMR spectrum.
a)Propose a structure for this compound.
b)How many signals would be present in the 13C NMR for this structure?

Accepted Answer

Question 3

If the proton attached to C2 in 1,1,2-tribromopropane is coupled with the protons on C1 (J = 3.5 Hz)and C3 (J = 6.8),draw the tree diagram of the C2 proton and predict the splitting pattern.

Accepted Answer

The answer of If the proton attached to C2 in...

Question 4

How many sets of equivalent protons are there in hexane,2-methylhexane,and 3-methylhexane,respectively?

Accepted Answer

The answer of How many sets of equivalent protons are...

Question 5

Nuclear magnetic resonance spectroscopy provides information about a molecule's:

Accepted Answer

A)  conjugated pi electron system.
B)  size and formula.
C)  carbon-hydrogen framework.
D)  functional groups.E) A) and C)
F) C) and D)

Question 6

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 7

Instructions: For each of the compounds below tell how many signals you would expect the molecule to have in its normal,broadband decoupled S1U1P113S1S1P0C NMR spectra.
-Number of signals:

Accepted Answer

The answer of Instructions: For each of the compounds below...

Question 8

Explain why all protons in a molecule do not absorb rf energy at the same frequency.

Accepted Answer

All nuclei in molecules are surrounded b...

Question 9

Which of the following combinations of peaks appears in the 1H NMR spectrum of 2-methylpropane?

Accepted Answer

A)  two singlets
B)  a singlet and a nonet
C)  a singlet and a decet
D)  a doublet and a decetE) None of the above
F) A) and B) D

Question 10

Instructions: Refer to the structure of 3-methylbutan-2-one below to answer the following question(s) .

-Refer to instructions.What is the splitting pattern for the hydrogens in 3-methylbutan-2-one labeled A,B,and C,respectively?

Accepted Answer

A)  singlet,singlet,singlet
B)  singlet,septet,quartet
C)  singlet,septet,doublet
D)  singlet,septet,doublet,doubletE) A) and B)
F) C) and D)

Question 11

How many positive and negative peaks appear in the DEPT-135 and in the DEPT-90 spectrum of 2-methylpentane?

Accepted Answer

A)  DEPT-135: two positive and one negative,DEPT-90: one positive
B)  DEPT-135: three positive and two negative,DEPT-90: one positive
C)  DEPT-135: three positive and two negative,DEPT-90: no signals
D)  DEPT-135: two positive and three negative,DEPT-90: two positiveE) C) and D)
F) A) and B)

Question 12

Which of the following compounds would produce the most downfield signal in a 13C NMR spectrum? 13C NMR spectrum?   A) A B) B C) C D) D" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  A
B)  B
C)  C
D)  DE) None of the above
F) B) and D)

Question 13

Treatment of tert-butyl alcohol with hydrogen chloride yields a mixture of tert-butyl chloride and 2-methylpropene.
 
a)After chromatographic separation, how would you use 1H NMR to help you decide which was which?	 
b)How would the 13C NMR for the two compounds differ?

Accepted Answer

Question 14

Instructions: For each of the compounds below tell how many signals you would expect the molecule to have in its normal,broadband decoupled S1U1P113S1S1P0C NMR spectra.
-Number of signals:

Accepted Answer

The answer of Instructions: For each of the compounds below...

Question 15

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

Question 16

How many signals appear in the broadband-decoupled 13C NMR spectrum of 1,3-dibromobenzene?

Accepted Answer

A)  1
B)  2
C)  3
D)  4E) B) and C)
F) All of the above

Question 17

Which of the following combinations of peaks appears in the 1H NMR spectrum of diethyl ether,CH3CH2OCH2CH3?

Accepted Answer

A)  a triplet and a doublet
B)  a quartet and a sextet
C)  two singlets
D)  a triplet and a quartetE) A) and C)
F) A) and B) D

Question 18

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 E)
G) B) and D)

Question 19

Instructions: To answer the following questions,consider the data and S1U1P11S1S1P0H NMR spectrum below.
The mass spectrum of this compound shows a molecular ion at m/z = 113,the IR spectrum has characteristic absorptions at 2270 and 1735 cmS1U1P1-1S1S1P0,and the S1U1P113S1S1P0C NMR spectrum has five signals.
 
(Spectrum obtained from:SDBSWeb:http://www.aist.go.jp/RIODB/SDBS/)

-Refer to instructions.How many types of nonequivalent protons are there in this molecule?

Accepted Answer

The answer of Instructions: To answer the following questions,consider the...

Question 20

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...

Exam 11: Structure Determination: Nuclear Magnetic Resonance Spectroscopy

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
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A compound with the molecular formula C₅H₁₂O produces only two singlets in the ¹H NMR spectrum. a)Propose a structure for this compound. b)How many signals would be present in the ¹³C NMR for this structure?

Correct Answer
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If the proton attached to C2 in 1,1,2-tribromopropane is coupled with the protons on C1 (J = 3.5 Hz)and C3 (J = 6.8),draw the tree diagram of the C2 proton and predict the splitting pattern.

Correct Answer
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How many sets of equivalent protons are there in hexane,2-methylhexane,and 3-methylhexane,respectively?

Correct Answer
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Nuclear magnetic resonance spectroscopy provides information about a molecule's:

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

Correct Answer
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11ea7ca1_4b4a_9845_9d3f_835010bcf685_TB4938_00

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
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Explain why all protons in a molecule do not absorb rf energy at the same frequency.

Correct Answer
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All nuclei in molecules are surrounded b...
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Which of the following combinations of peaks appears in the ¹H NMR spectrum of 2-methylpropane?

Correct Answer
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D

Instructions: Refer to the structure of 3-methylbutan-2-one below to answer the following question(s) . -Refer to instructions.What is the splitting pattern for the hydrogens in 3-methylbutan-2-one labeled A,B,and C,respectively?

Correct Answer
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How many positive and negative peaks appear in the DEPT-135 and in the DEPT-90 spectrum of 2-methylpentane?

Correct Answer
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Which of the following compounds would produce the most downfield signal in a ¹³C NMR spectrum?

Correct Answer
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Treatment of tert-butyl alcohol with hydrogen chloride yields a mixture of tert-butyl chloride and 2-methylpropene. a)After chromatographic separation, how would you use ¹H NMR to help you decide which was which? b)How would the ¹³C NMR for the two compounds differ?

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

Correct Answer
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How many signals appear in the broadband-decoupled ¹³C NMR spectrum of 1,3-dibromobenzene?

Correct Answer
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Which of the following combinations of peaks appears in the ¹H NMR spectrum of diethyl ether,CH₃CH₂OCH₂CH₃?

Correct Answer
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D

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

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

Correct Answer
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Exam 11: Structure Determination: Nuclear Magnetic Resonance Spectroscopy

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

A compound with the molecular formula C5H12O produces only two singlets in the 1H NMR spectrum. a)Propose a structure for this compound. b)How many signals would be present in the 13C NMR for this structure?

Correct AnswerverifiedShow Answer

If the proton attached to C2 in 1,1,2-tribromopropane is coupled with the protons on C1 (J = 3.5 Hz)and C3 (J = 6.8),draw the tree diagram of the C2 proton and predict the splitting pattern.

Correct AnswerverifiedShow Answer

How many sets of equivalent protons are there in hexane,2-methylhexane,and 3-methylhexane,respectively?

Correct AnswerverifiedShow Answer

Nuclear magnetic resonance spectroscopy provides information about a molecule's:

Correct AnswerverifiedShow Answer

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

Correct Answerverified11ea7ca1_4b4a_9845_9d3f_835010bcf685_TB4938_00

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

Explain why all protons in a molecule do not absorb rf energy at the same frequency.

Correct AnswerverifiedAll nuclei in molecules are surrounded b...View AnswerShow Answer

Which of the following combinations of peaks appears in the 1H NMR spectrum of 2-methylpropane?

Correct AnswerverifiedD

Instructions: Refer to the structure of 3-methylbutan-2-one below to answer the following question(s) . -Refer to instructions.What is the splitting pattern for the hydrogens in 3-methylbutan-2-one labeled A,B,and C,respectively?

Correct AnswerverifiedShow Answer

How many positive and negative peaks appear in the DEPT-135 and in the DEPT-90 spectrum of 2-methylpentane?

Correct AnswerverifiedShow Answer

Which of the following compounds would produce the most downfield signal in a 13C NMR spectrum?

Correct AnswerverifiedShow Answer

Treatment of tert-butyl alcohol with hydrogen chloride yields a mixture of tert-butyl chloride and 2-methylpropene. a)After chromatographic separation, how would you use 1H NMR to help you decide which was which? b)How would the 13C NMR for the two compounds differ?

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

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

Correct AnswerverifiedShow Answer

How many signals appear in the broadband-decoupled 13C NMR spectrum of 1,3-dibromobenzene?

Correct AnswerverifiedShow Answer

Which of the following combinations of peaks appears in the 1H NMR spectrum of diethyl ether,CH3CH2OCH2CH3?

Correct AnswerverifiedD

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

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 Answer
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A compound with the molecular formula C₅H₁₂O produces only two singlets in the ¹H NMR spectrum. a)Propose a structure for this compound. b)How many signals would be present in the ¹³C NMR for this structure?

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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11ea7ca1_4b4a_9845_9d3f_835010bcf685_TB4938_00

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

Correct Answer
verified
All nuclei in molecules are surrounded b...
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Which of the following combinations of peaks appears in the ¹H NMR spectrum of 2-methylpropane?

Correct Answer
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D

Correct Answer
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Correct Answer
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Which of the following compounds would produce the most downfield signal in a ¹³C NMR spectrum?

Correct Answer
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Treatment of tert-butyl alcohol with hydrogen chloride yields a mixture of tert-butyl chloride and 2-methylpropene. a)After chromatographic separation, how would you use ¹H NMR to help you decide which was which? b)How would the ¹³C NMR for the two compounds differ?

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

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

Correct Answer
verified

How many signals appear in the broadband-decoupled ¹³C NMR spectrum of 1,3-dibromobenzene?

Correct Answer
verified

Which of the following combinations of peaks appears in the ¹H NMR spectrum of diethyl ether,CH₃CH₂OCH₂CH₃?

Correct Answer
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D

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

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