Question 1

An unknown compound has the formula of C9H12. The following 1H NMR peaks were observed: Doublet at  1.22
Septet at  2.83
Multiplet at  7.09
From the data above, pick the compound below that fits the spectra data. 9H12. The following 1H NMR peaks were observed: Doublet at  1.22 Septet at  2.83 Multiplet at  7.09 From the data above, pick the compound below that fits the spectra data.   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) All of the above
F) A) and B)

Question 2

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 B)

Question 3

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

Accepted Answer

A)   I = 6; II = 3; III = 4.
B)   I = 5; II = 3; III = 4.
C)   I = 6; II = 4; III = 5.
D)   I = 6; II = 4; III = 4.E) All of the above
F) A) and C)

Question 4

An unknown compound X has the molecular formula C10H11O2Br. Compound X shows a strong absorption in its IR spectrum at 1700 cm-1. The 1H NMR spectral data for compound X is given below. What is the structure of compound X? 10H11O2Br. Compound X shows a strong absorption in its IR spectrum at 1700 cm-1. The 1H NMR spectral data for compound X is given below. What is the structure of compound X?   A)  Only I B)  Only II C)  Only III D)  I or II" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   Only I
B)   Only II
C)   Only III
D)   I or IIE) All of the above
F) B) and C)

Question 5

Which of the following compounds does not show only one signal in its 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) None of the above

Question 6

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) None of the above
F) All of the above

Question 7

Which of the indicated protons 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) All of the above
F) None of the above

Question 8

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 = 5.E) A) and B)
F) All of the above

Question 9

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 C)
F) B) and C) C

Question 10

An unknown compound A has the molecular formula C7H14O2. Compound A absorbs strongly in the IR at 1700 cm-1. The 1H NMR spectral data for compound A are given below. What is the structure of compound A? 7H14O2. Compound A absorbs strongly in the IR at 1700 cm-1. The 1H NMR spectral data for compound A are given below. What is the structure of compound A?   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 11

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) All of the above

Question 12

How could spectroscopy be used to distinguish between the following compounds? 1H NMR spectrum at 1.0 ppm. B)  Compound B has a peak at 3200-3500 cm-1 in its IR spectrum. C)  Compound A has a peak in its IR spectrum at 2900 cm-1. D)  Compound A has a triplet in its 1H NMR spectrum at 1.0 ppm and compound B has a peak at 3200-3500 cm-1 in its IR spectrum." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   Compound A has a triplet in its 1H NMR spectrum at 1.0 ppm.
B)   Compound B has a peak at 3200-3500 cm-1 in its IR spectrum.
C)   Compound A has a peak in its IR spectrum at 2900 cm-1.
D)   Compound A has a triplet in its 1H NMR spectrum at 1.0 ppm and compound B has a peak at 3200-3500 cm-1 in its IR spectrum.E) A) and B)
F) B) and C)

Question 13

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

Accepted Answer

A)   a: 5; b: 6
B)   a: 5; b: 5
C)   a: 4; b: 6
D)   a: 4; b: 5E) None of the above
F) All of the above

Question 14

Into how many peaks will the circled proton be split?

Accepted Answer

A)   5
B)   6
C)   7
D)   8E) B) and D)
F) None of the above

Question 15

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

Accepted Answer

A)   I = 6; II = 3; III = 6.
B)   I = 5; II = 4; III = 6.
C)   I = 6; II = 4; III = 4.
D)   I = 6; II = 4; III = 6.E) B) and D)
F) All of the above D

Question 16

How many peaks would be observed for each of the circled protons in the compounds below?

Accepted Answer

A)   I = 1; II = 4; III = 7.
B)   I = 3; II = 3; III = 7.
C)   I = 2; II = 4; III = 7.
D)   I = 2; II = 4; III = 6.E) A) and D)
F) A) 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 = 5.E) A) and B)
F) C) and D) D

Question 18

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) A) and D)
F) A) and C)

Question 19

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 = 1.E) All of the above
F) B) and D)

Question 20

How many peaks would be observed for each of the circled protons in the compounds below?

Accepted Answer

A)   I = 8; II = 4; III = 3; IV = 3.
B)   I = 7; II = 4; III = 3; IV = 4.
C)   I = 7; II = 3; III = 3; IV = 3.
D)   I = 7; II = 4; III = 2; IV = 4.E) A) and B)
F) None of the above

Exam 14: Nuclear Magnetic Resonance Spectroscopy

An unknown compound has the formula of C9H12. The following 1H NMR peaks were observed: Doublet at  1.22 Septet at  2.83 Multiplet at  7.09 From the data above, pick the compound below that fits the spectra data.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An unknown compound X has the molecular formula C10H11O2Br. Compound X shows a strong absorption in its IR spectrum at 1700 cm-1. The 1H NMR spectral data for compound X is given below. What is the structure of compound X?

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Which of the following compounds does not show only one signal in its 1H NMR spectrum?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

An unknown compound A has the molecular formula C7H14O2. Compound A absorbs strongly in the IR at 1700 cm-1. The 1H NMR spectral data for compound A are given below. What is the structure of compound A?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How could spectroscopy be used to distinguish between the following compounds?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Into how many peaks will the circled proton be split?

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

Correct AnswerverifiedD

How many peaks would be observed for each of the circled protons in the compounds below?

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

Correct AnswerverifiedD

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

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How many peaks would be observed for each of the circled protons in the compounds below?

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An unknown compound has the formula of C₉H₁₂. The following ¹H NMR peaks were observed: Doublet at  1.22 Septet at  2.83 Multiplet at  7.09 From the data above, pick the compound below that fits the spectra data.

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

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An unknown compound X has the molecular formula C₁₀H₁₁O₂Br. Compound X shows a strong absorption in its IR spectrum at 1700 cm^-1. The ¹H NMR spectral data for compound X is given below. What is the structure of compound X?

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Which of the following compounds does not show only one signal in its ¹H NMR spectrum?

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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 would absorb furthest downfield in a ¹H NMR spectrum?

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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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C

An unknown compound A has the molecular formula C₇H₁₄O₂. Compound A absorbs strongly in the IR at 1700 cm^-1. The ¹H NMR spectral data for compound A are given below. What is the structure of compound A?

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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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D

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D

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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