Question 1

Give the expected splitting patterns for HA,HB,HC,and HD.

Accepted Answer

H_A: singlet...

Question 2

Which m/z value would indicate that nitrogen was present in a sample?

Accepted Answer

A)  m / z 13
B)  m / z  100
C)  m / z  104
D)  m / z  150
E)  m / z  155F) B) and C)
G) All of the above

Question 3

The mass spectrum for an unknown molecule has an M+ peak with a relative intensity of 12.5 and an M + 1 peak with a relative intensity of 2.48.How many carbons are in the unknown molecule?

Accepted Answer

Question 4

Draw a splitting diagram for HA and indicate the expected splitting pattern.

Accepted Answer

H_A is a dou...

Question 5

How many chemically distinct hydrogen atoms are in the following molecule?

Accepted Answer

The answer of How many chemically distinct hydrogen atoms are...

Question 6

For the following molecule,give the splitting patterns for HA,HB,and HC.

Accepted Answer

H_A,H_B,and H_C ...

Question 7

Which compound would produce the 1H NMR spectrum below? 1H NMR spectrum below?     A) I B) II C) III D) IV E) V" class="answers-bank-image d-inline" rel="preload" >
1H NMR spectrum below?     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)  VF) A) and E)
G) B) and C)

Question 8

Explain how coupling constants can be used to determine whether an NMR spectrum represents compound A or compound B.

Accepted Answer

The hydrogens in compound A are coupled ...

Question 9

What apparent splitting pattern would not be found in the 1H NMR spectrum or the following molecule? 1H NMR spectrum or the following molecule?   A) Singlet B) Doublet C) Triplet D) Quartet E) Quintet" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Singlet
B)  Doublet
C)  Triplet
D)  Quartet
E)  QuintetF) D) and E)
G) B) and C)

Question 10

How many chemically distinct hydrogen atoms are in the following molecule?

Accepted Answer

The answer of How many chemically distinct hydrogen atoms are...

Question 11

How many distinct signals are in the 13C NMR of the following compound? 13C NMR of the following compound?   A) Four B) Five C) Six D) Seven E) Eight" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Four
B)  Five
C)  Six
D)  Seven
E)  EightF) A) and D)
G) None of the above

Question 12

Which of the following is the base peak?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  VF) C) and E)
G) A) and B)

Question 13

Which of the following molecules would have a singlet at 2.1 ppm?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  VF) B) and C)
G) B) and E)

Question 14

Which hydrogen type has the smallest integration value? A B) HB C) HC D) HD E) HE" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  HA
B)  HB
C)  HC
D)  HD
E)  HEF) All of the above
G) D) and E)

Question 15

Which hydrogen atom has the greatest chemical shift? A B) HB C) HC D) HD E) HE" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  HA
B)  HB
C)  HC
D)  HD
E)  HEF) A) and D)
G) B) and C)

Question 16

Explain how you can use a mass spectrum to determine if a single nitrogen is present in a molecule.

Accepted Answer

If a single nitrogen...

Question 17

Which type of atom is likely present in the molecule responsible for the following mass spectrum?

Accepted Answer

A)  N
B)  F
C)  Cl
D)  Br
E)  IF) A) and C)
G) B) and C)

Question 18

Which hydrogen in the following molecule has the greatest integration value?

Accepted Answer

The answer of Which hydrogen in the following molecule has...

Question 19

How many chemically distinct hydrogen atoms are in the following molecule?

Accepted Answer

A)  Four types
B)  Five types
C)  Six types
D)  Seven types
E)  Eight typesF) B) and D)
G) A) and D)

Question 20

Which proton in the following molecule has the greatest chemical shift?

Accepted Answer

The answer of Which proton in the following molecule has...

Exam 18: Structure Determination 2: Nuclear Magnetic Resonance Spectroscopy and Mass Spectrometry

How many chemically distinct hydrogen atoms are in the following molecule?

Correct AnswerverifiedShow Answer

What apparent splitting pattern would not be found in the 1H NMR spectrum or the following molecule?

Correct AnswerverifiedShow Answer

How many distinct signals are in the 13C NMR of the following compound?

Correct AnswerverifiedShow Answer

Which of the following molecules would have a singlet at 2.1 ppm?

Correct AnswerverifiedShow Answer

How many chemically distinct hydrogen atoms are in the following molecule?

Correct AnswerverifiedShow Answer

Explain how you can use a mass spectrum to determine if a single nitrogen is present in a molecule.

Correct AnswerverifiedIf a single nitrogen...View AnswerShow Answer

Give the expected splitting patterns for HA,HB,HC,and HD.

Correct AnswerverifiedHA: singlet...View AnswerShow Answer

Which type of atom is likely present in the molecule responsible for the following mass spectrum?

Correct AnswerverifiedShow Answer

The mass spectrum for an unknown molecule has an M+ peak with a relative intensity of 12.5 and an M + 1 peak with a relative intensity of 2.48.How many carbons are in the unknown molecule?

Correct AnswerverifiedShow Answer

Which compound would produce the 1H NMR spectrum below?

Correct AnswerverifiedShow Answer

How many chemically distinct hydrogen atoms are in the following molecule?

Correct AnswerverifiedShow Answer

Draw a splitting diagram for HA and indicate the expected splitting pattern.

Correct AnswerverifiedHA is a dou...View AnswerShow Answer

Which hydrogen atom has the greatest chemical shift?

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Which proton in the following molecule has the greatest chemical shift?

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For the following molecule,give the splitting patterns for HA,HB,and HC.

Correct AnswerverifiedHA,HB,and HC ...View AnswerShow Answer

Explain how coupling constants can be used to determine whether an NMR spectrum represents compound A or compound B.

Correct AnswerverifiedThe hydrogens in compound A are coupled ...View AnswerShow Answer

Which hydrogen type has the smallest integration value?

Correct AnswerverifiedShow Answer

Which m/z value would indicate that nitrogen was present in a sample?

Correct AnswerverifiedShow Answer

Which hydrogen in the following molecule has the greatest integration value?

Correct AnswerverifiedShow Answer

Which of the following is the base peak?

Correct AnswerverifiedShow Answer

Correct Answer
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What apparent splitting pattern would not be found in the ¹H NMR spectrum or the following molecule?

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How many distinct signals are in the ¹³C NMR of the following compound?

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If a single nitrogen...
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Give the expected splitting patterns for H_A,H_B,H_C,and H_D.

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H_A: singlet...
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The mass spectrum for an unknown molecule has an M⁺ peak with a relative intensity of 12.5 and an M + 1 peak with a relative intensity of 2.48.How many carbons are in the unknown molecule?

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Which compound would produce the ¹H NMR spectrum below?

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Correct Answer
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Draw a splitting diagram for H_A and indicate the expected splitting pattern.

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H_A is a dou...
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Correct Answer
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For the following molecule,give the splitting patterns for H_A,H_B,and H_C.

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H_A,H_B,and H_C ...
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The hydrogens in compound A are coupled ...
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