Question 1

The  ADVANCE \u 21 ADVANCE \d 2H NMR spectrum of 1-propanol displays a singlet for the OH proton instead of a triplet. Explain why.

Accepted Answer

A rapid exchange of the OH pro

Question 2

A compound with molecular formula C7H14O2 displays the following IR, 1H NMR, 13C NMR spectra. Propose a structure for this compound.   
 
SDBS

Accepted Answer

Question 3

Which of the indicated protons in the following compound would appear most downfield in the 1H NMR spectrum?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 4

A compound with molecular formula C6H11N has the following 1H NMR spectrum. Which of the following is the correct number of protons giving rise to each signal? SHAPE \* MERGEFORMAT

Accepted Answer

A)  I - 6H, II - 3H, III - 2H 
B)  I - 5H, II - 4H, III - 2H 
C)  I - 6H, II - 4H, III - 1H 
D)  I - 1H, II - 4H, III - 6H 
A)  I - 6H, II - 3H, III - 2H 
B)  I - 5H, II - 4H, III - 2H 
C)  I - 6H, II - 4H, III - 1H 
D)  I - 1H, II - 4H, III - 6H

Question 5

Protons Ha and Hb in the following compound are _________.

Accepted Answer

A)  homotopic 
B)  enantiotopic 
C)  diastereotopic 
D)  mesotopic 
E)  none of these 
A)  homotopic 
B)  enantiotopic 
C)  diastereotopic 
D)  mesotopic 
E)  none of these

Question 6

Which of the following is the maximum multiplicity observed for Hb protons in the following compound? Assume that Jab and Jbc values are different.

Accepted Answer

A)  9 
B)  12 
C)  21 
D)  24 
E)  none of these 
A)  9 
B)  12 
C)  21 
D)  24 
E)  none of these

Question 7

Protons Ha and Hb in the following compound are _________.

Accepted Answer

A)  homotopic 
B)  enantiotopic 
C)  diastereotopic 
D)  mesotopic 
E)  none of these 
A)  homotopic 
B)  enantiotopic 
C)  diastereotopic 
D)  mesotopic 
E)  none of these

Question 8

Which of the following compounds displays two triplets and a singlet in its 1H NMR spectrum?

Accepted Answer

A)  CH3CH(OCH3)2 
B)  CH3OCH2CH2OCH3 
C)  CH3OCH2CH(OH)CH3 
D)  CH3OCH2CH2CH2CH2OCH3 
E)  CH3CH2OCH2CH3 
A)  CH3CH(OCH3)2 
B)  CH3OCH2CH2OCH3 
C)  CH3OCH2CH(OH)CH3 
D)  CH3OCH2CH2CH2CH2OCH3 
E)  CH3CH2OCH2CH3

Question 9

How many signals would you expect to find in the 13C NMR spectrum of the following compound?

Accepted Answer

A)  6 
B)  7 
C)  8 
D)  9 
E)  10 
A)  6 
B)  7 
C)  8 
D)  9 
E)  10

Question 10

How many signals would you expect to find in the 13C NMR spectrum of the following compound?

Accepted Answer

A)  2 
B)  3 
C)  4 
D)  5 
E)  6 
A)  2 
B)  3 
C)  4 
D)  5 
E)  6

Question 11

Propose a structure for a compound, with molecular formula C8H15ClO3, that fits the following spectroscopic data:
IR: 1780 cm-1, 1150 cm-1
1H NMR: 1.1 $\delta$  (triplet, 6H), 1.9 $\delta$  (quartet, 2H), 2.8 $\delta$  (triplet, 2H), 3.4 $\delta$  (quartet, 4H), 4.2 $\delta$  (triplet, 1H)
13C NMR: 15, 31, 38, 57, 100, 173

Accepted Answer

The answer of Propose a structure for a compound, with...

Question 12

How many signals would you expect in the 1H NMR spectrum of the following compound?

Accepted Answer

A)  4 
B)  5 
C)  6 
D)  7 
E)  8 
A)  4 
B)  5 
C)  6 
D)  7 
E)  8

Question 13

How many signals would you expect in the 1H NMR spectrum of the following compound?

Accepted Answer

A)  4 
B)  5 
C)  6 
D)  7 
E)  9 
A)  4 
B)  5 
C)  6 
D)  7 
E)  9

Question 14

A compound with molecular formula C8H14 has the following 1H NMR spectrum. Which of the following is the correct number of protons giving rise to each signal? SHAPE \* MERGEFORMAT

Accepted Answer

A)  I - 3H, II - 9H, III - 2H 
B)  I - 2H, II - 9H, III - 3H 
C)  I - 4H, II - 6H, III - 4H 
D)  I - 3H, II - 6H, III - 2H 
A)  I - 3H, II - 9H, III - 2H 
B)  I - 2H, II - 9H, III - 3H 
C)  I - 4H, II - 6H, III - 4H 
D)  I - 3H, II - 6H, III - 2H

Question 15

How would you use 1H NMR spectroscopy to distinguish between the following compounds?

Accepted Answer

Both compounds will have three signals.

Question 16

Determine the multiplicity of each signal in the expected 1H NMR spectrum of the following compound.

Accepted Answer

Question 17

Which of the following 13C NMR chemical shifts corresponds to Ca in the following compound?

Accepted Answer

A)  100 - 150 ppm 
B)  200 - 220 ppm 
C)  60 - 90 ppm 
D)  45 - 60 ppm 
E)  45 - 80 ppm 
A)  100 - 150 ppm 
B)  200 - 220 ppm 
C)  60 - 90 ppm 
D)  45 - 60 ppm 
E)  45 - 80 ppm

Question 18

Protons Ha and Hb in the following compound are _________.

Accepted Answer

A)  homotopic 
B)  enantiotopic 
C)  diastereotopic 
D)  mesotopic 
E)  none of these 
A)  homotopic 
B)  enantiotopic 
C)  diastereotopic 
D)  mesotopic 
E)  none of these

Question 19

How many nuclear spin states are possible for the 1H nucleus?

Accepted Answer

A)  1 
B)  2 
C)  4 
D)  5 
E)  none of these 
A)  1 
B)  2 
C)  4 
D)  5 
E)  none of these

Question 20

Determine the multiplicity of each signal in the expected 1H NMR spectrum of the following compound.

Accepted Answer

Exam 15: Nuclear Magnetic Resonance Spectroscopy

The ADVANCE \u 21 ADVANCE \d 2H NMR spectrum of 1-propanol displays a singlet for the OH proton instead of a triplet. Explain why.

A compound with molecular formula C7H14O2 displays the following IR, 1H NMR, 13C NMR spectra. Propose a structure for this compound. SDBS

Which of the indicated protons in the following compound would appear most downfield in the 1H NMR spectrum?

A compound with molecular formula C6H11N has the following 1H NMR spectrum. Which of the following is the correct number of protons giving rise to each signal? SHAPE \* MERGEFORMAT

Protons Ha and Hb in the following compound are _________.

Which of the following is the maximum multiplicity observed for Hb protons in the following compound? Assume that Jab and Jbc values are different.

Protons Ha and Hb in the following compound are _________.

Which of the following compounds displays two triplets and a singlet in its 1H NMR spectrum?

How many signals would you expect to find in the 13C NMR spectrum of the following compound?

How many signals would you expect to find in the 13C NMR spectrum of the following compound?

How many signals would you expect in the 1H NMR spectrum of the following compound?

How many signals would you expect in the 1H NMR spectrum of the following compound?

A compound with molecular formula C8H14 has the following 1H NMR spectrum. Which of the following is the correct number of protons giving rise to each signal? SHAPE \* MERGEFORMAT

How would you use 1H NMR spectroscopy to distinguish between the following compounds?

Determine the multiplicity of each signal in the expected 1H NMR spectrum of the following compound.

Which of the following 13C NMR chemical shifts corresponds to Ca in the following compound?

Protons Ha and Hb in the following compound are _________.

How many nuclear spin states are possible for the 1H nucleus?

Determine the multiplicity of each signal in the expected 1H NMR spectrum of the following compound.

A Review of General Chemistry: Electrons, Bonds, and Molecular Properties

Molecular Representations

Acids and Bases

Alkanes and Cycloalkanes

Stereoisomerism

Chemical Reactivity and Mechanisms

Alkyl Halides: Nucleophilic Substitution and Elimination Reactions

Addition Reactions of Alkenes

Alkynes

Radical Reactions

Synthesis

Alcohols and Phenols

Ethers and Epoxides; Thiols and Sulfides

Infrared Spectroscopy and Mass Spectrometry

Conjugated Pi Systems and Pericyclic Reactions

Aromatic Compounds

Aromatic Substitution Reactions

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Alpha Carbon Chemistry: Enols and Enolates

Amines

Introduction to Organometallic Compounds

Carbohydrates

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

Filters

The ^{ADVANCE \u 2}¹ ADVANCE \d 2H NMR spectrum of 1-propanol displays a singlet for the OH proton instead of a triplet. Explain why.

A compound with molecular formula C₇H₁₄O₂ displays the following IR, ¹H NMR, ¹³C NMR spectra. Propose a structure for this compound. SDBS

Which of the indicated protons in the following compound would appear most downfield in the ¹H NMR spectrum?

Protons H_a and H_b in the following compound are _________.

Which of the following is the maximum multiplicity observed for H_b protons in the following compound? Assume that J_ab and J_bc values are different.

Protons H_a and H_b in the following compound are _________.

Which of the following compounds displays two triplets and a singlet in its ¹H NMR spectrum?

How many signals would you expect to find in the ¹³C NMR spectrum of the following compound?

How many signals would you expect to find in the ¹³C NMR spectrum of the following compound?

How many signals would you expect in the ¹H NMR spectrum of the following compound?

How many signals would you expect in the ¹H NMR spectrum of the following compound?

How would you use ¹H NMR spectroscopy to distinguish between the following compounds?

Determine the multiplicity of each signal in the expected ¹H NMR spectrum of the following compound.

Which of the following ¹³C NMR chemical shifts corresponds to C_ain the following compound?

Protons H_a and H_b in the following compound are _________.

How many nuclear spin states are possible for the ¹H nucleus?

Determine the multiplicity of each signal in the expected ¹H NMR spectrum of the following compound.