Question 1

An unknown compound X has the empirical formula C3H6O and a molecular ion in its mass spectrum at 116.Compound X shows no IR absorption at 3200-3600 cm-1 but shows a peak at 1700 cm-1.The 1H NMR spectral data of X is shown below.What is the structure of compound X? 3H6O and a molecular ion in its mass spectrum at 116.Compound X shows no IR absorption at 3200-3600 cm-1 but shows a peak at 1700 cm-1.The 1H NMR spectral data of X is shown below.What is the structure of compound X?   A) I B) II C) III D) IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) B) and C)
F) A) and B)

Question 2

Into how many peaks will the circled proton be split?

Accepted Answer

A)  5
B)  6
C)  7
D)  8E) B) and D)
F) All of the above

Question 3

How many different kinds of protons are present in the following molecule?

Accepted Answer

A)  2
B)  3
C)  4
D)  5E) None of the above
F) B) and C)

Question 4

How many different kinds of protons are present in each of the following compounds?

Accepted Answer

A)  I = 4; II = 3; III = 1
B)  I = 4; II = 4; III = 1
C)  I = 4; II = 4; III = 2
D)  I = 3; II = 3; III = 1E) A) and B)
F) A) and C)

Question 5

For each of the following compounds,indicate how many 13C NMR signals will be seen. 13C NMR signals will be seen.   A) a: 3; b: 3; c: 5; d: 3 B) a: 4; b: 3; c: 5; d: 3 C) a: 3; b: 4; c: 5; d: 3 D) a: 4; b: 3; c: 3; d: 3" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  a: 3; b: 3; c: 5; d: 3
B)  a: 4; b: 3; c: 5; d: 3
C)  a: 3; b: 4; c: 5; d: 3
D)  a: 4; b: 3; c: 3; d: 3E) C) and D)
F) B) and D)

Question 6

Which of the indicated protons absorbs furthest downfield? a B) Hb C) Hc D) Hd" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Ha
B)  Hb
C)  Hc
D)  HdE) None of the above
F) B) and C)

Question 7

Which compound does not give four sets of absorptions in its 1H NMR spectrum (i.e.,which compound does not have four unique hydrogens) ? 1H NMR spectrum (i.e.,which compound does not have four unique hydrogens) ?   A) I B) II C) III D) IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) A) and B)
F) None of the above

Question 8

Which of the indicated protons absorbs further downfield? A B) HB C) HC D) HD" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  HA
B)  HB
C)  HC
D)  HDE) All of the above
F) None of the above

Question 9

An unknown compound X has the molecular formula C6H14O.Compound X shows a peak in its IR spectrum at 3200-3600 cm-1.The 1H NMR spectral data for compound X is given below.What is the structure of compound X? 6H14O.Compound X shows a peak in its IR spectrum at 3200-3600 cm-1.The 1H NMR spectral data for compound X is given below.What is the structure of compound X?   A) I B) II C) III D) IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) B) and D)
F) C) and D)

Question 10

How many different kinds of 13C peaks will be seen? 13C peaks will be seen?   A) 2 B) 3 C) 4 D) 5" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  2
B)  3
C)  4
D)  5E) A) and D)
F) B) and D)

Question 11

For each of the following compounds,indicate how many 13C NMR signals will be observed. 13C NMR signals will be observed.   A) a: 4; b: 4; c: 7; d: 4 B) a: 5; b: 4; c: 7; d: 3 C) a: 4; b: 7; c: 7; d: 3 D) a: 5; b: 4; c: 6; d: 5" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  a: 4; b: 4; c: 7; d: 4
B)  a: 5; b: 4; c: 7; d: 3
C)  a: 4; b: 7; c: 7; d: 3
D)  a: 5; b: 4; c: 6; d: 5E) A) and C)
F) None of the above

Question 12

An unknown compound X has the molecular formula C6H12O2.Compound X shows a strong peak in its IR spectrum at 1700 cm-1.The 1H NMR spectral data of compound X is given below.What is the structure of compound X? 6H12O2.Compound X shows a strong peak in its IR spectrum at 1700 cm-1.The 1H NMR spectral data of compound X is given below.What is the structure of compound X?   A) I B) II C) III D) IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) None of the above
F) B) and D)

Question 13

How many different kinds of protons are present in each of the following molecules?

Accepted Answer

A)  I = 3; II = 5; III = 5; IV = 4; V = 3
B)  I = 4; II = 5; III = 4; IV = 4; V = 3
C)  I = 4; II = 5; III = 5; IV = 4; V = 3
D)  I = 4; II = 5; III = 5; IV = 3; V = 4E) None of the above
F) A) and B)

Question 14

What is the relationship between Ha and Hb in the following compound? a and Hb in the following compound?   A) Homotopic B) Enantiotopic C) Diastereotopic D) Mesotopic" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Homotopic
B)  Enantiotopic
C)  Diastereotopic
D)  MesotopicE) B) and C)
F) A) and D)

Question 15

Into how many peaks will each of the circled protons be split? (Assume complete resolution of all NMR peaks is possible)

Accepted Answer

A)  I = 3; II = 7; III = 4
B)  I = 2; II = 7; III = 4
C)  I = 2; II = 7; III = 3
D)  I = 2; II = 6; III = 4E) None of the above
F) B) and C)

Question 16

Which of the indicated protons in the molecules below would absorb furthest downfield in a 1H NMR spectrum? 1H NMR spectrum?   A) I B) II C) III D) IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) A) and B)
F) B) and C)

Question 17

How many different kinds of protons are present in each of the following compounds?

Accepted Answer

A)  I = 4; II = 4; III = 4
B)  I = 4; II = 4; III = 5
C)  I = 3; II = 3; III = 5
D)  I = 3; II = 4; III = 5E) B) and D)
F) B) and C)

Question 18

How many different kinds of protons are present in each of the following compounds?

Accepted Answer

A)  I = 2; II = 4; III = 6
B)  I = 2; II = 4; III = 4
C)  I = 3; II = 3; III = 5
D)  I = 2; II = 4; III = 5E) A) and B)
F) A) and C)

Question 19

What is the relationship between Ha and Hb in the following compound? a and Hb in the following compound?   A) Homotopic B) Enantiotopic C) Diastereotopic D) Mesotopic" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Homotopic
B)  Enantiotopic
C)  Diastereotopic
D)  MesotopicE) B) and D)
F) B) and C)

Question 20

An unknown compound X has the molecular formula C6H14O.Compound X shows a strong peak in its IR spectrum at 3000 cm-1.The 1H NMR spectral data of compound X is given below.What is the structure of compound X? 6H14O.Compound X shows a strong peak in its IR spectrum at 3000 cm-1.The 1H NMR spectral data of compound X is given below.What is the structure of compound X?   A) I B) II C) III D) IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) C) and D)
F) A) and B)

Exam 32: Spectroscopy C: Nuclear Magnetic Resonance Spectroscopy

An unknown compound X has the molecular formula C6H12O2.Compound X shows a strong peak in its IR spectrum at 1700 cm-1.The 1H NMR spectral data of compound X is given below.What is the structure of compound X?

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For each of the following compounds,indicate how many 13C NMR signals will be seen.

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An unknown compound X has the empirical formula C3H6O and a molecular ion in its mass spectrum at 116.Compound X shows no IR absorption at 3200-3600 cm-1 but shows a peak at 1700 cm-1.The 1H NMR spectral data of X is shown below.What is the structure of compound X?

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An unknown compound X has the molecular formula C6H14O.Compound X shows a strong peak in its IR spectrum at 3000 cm-1.The 1H NMR spectral data of compound X is given below.What is the structure of compound X?

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What is the relationship between Ha and Hb in the following compound?

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How many different kinds of protons are present in each of the following compounds?

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Which of the indicated protons in the molecules below would absorb furthest downfield in a 1H NMR spectrum?

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How many different kinds of protons are present in each of the following compounds?

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Which of the indicated protons absorbs furthest downfield?

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How many different kinds of protons are present in the following molecule?

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Into how many peaks will the circled proton be split?

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How many different kinds of protons are present in each of the following compounds?

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Which of the indicated protons absorbs further downfield?

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An unknown compound X has the molecular formula C6H14O.Compound X shows a peak in its IR spectrum at 3200-3600 cm-1.The 1H NMR spectral data for compound X is given below.What is the structure of compound X?

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For each of the following compounds,indicate how many 13C NMR signals will be observed.

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How many different kinds of protons are present in each of the following molecules?

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How many different kinds of 13C peaks will be seen?

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Which compound does not give four sets of absorptions in its 1H NMR spectrum (i.e.,which compound does not have four unique hydrogens) ?

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What is the relationship between Ha and Hb in the following compound?

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Into how many peaks will each of the circled protons be split? (Assume complete resolution of all NMR peaks is possible)

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An unknown compound X has the molecular formula C₆H₁₂O₂.Compound X shows a strong peak in its IR spectrum at 1700 cm^-1.The ¹H NMR spectral data of compound X is given below.What is the structure of compound X?

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For each of the following compounds,indicate how many ¹³C NMR signals will be seen.

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An unknown compound X has the empirical formula C₃H₆O and a molecular ion in its mass spectrum at 116.Compound X shows no IR absorption at 3200-3600 cm^-1 but shows a peak at 1700 cm^-1.The ¹H NMR spectral data of X is shown below.What is the structure of compound X?

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An unknown compound X has the molecular formula C₆H₁₄O.Compound X shows a strong peak in its IR spectrum at 3000 cm^-1.The ¹H NMR spectral data of compound X is given below.What is the structure of compound X?

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What is the relationship between H_a and H_b in the following compound?

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Which of the indicated protons in the molecules below would absorb furthest downfield in a ¹H NMR spectrum?

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An unknown compound X has the molecular formula C₆H₁₄O.Compound X shows a peak in its IR spectrum at 3200-3600 cm^-1.The ¹H NMR spectral data for compound X is given below.What is the structure of compound X?

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For each of the following compounds,indicate how many ¹³C NMR signals will be observed.

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How many different kinds of ¹³C peaks will be seen?

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Which compound does not give four sets of absorptions in its ¹H NMR spectrum (i.e.,which compound does not have four unique hydrogens) ?

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What is the relationship between H_a and H_b in the following compound?

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Correct Answer
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