Question 1

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 2

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

Question 3

A compound with a molecular formula of CS1U1B110S1U1B0HS1U1B112S1U1B0OS1U1B12S1U1B0 has the following S1U1P11S1S1P0H NMR spectrum. Which of the following structures is consistent with this spectrum? 
SHAPE \* MERGEFORMAT

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these

Question 4

An unknown compound displays the following IR, 1H NMR, 13C NMR and.mass spectra. Propose a structure for this compound.         SDBS

Accepted Answer

Question 5

A compound, with molecular formula C11H14O, displays the following IR, 1H NMR and 13C NMR spectra. Propose a structure for this compound.

Accepted Answer

Question 6

Which of the following compounds will not display a carbonyl carbon signal in the DEPT-90 and DEPT-135 13C NMR spectroscopy?

Accepted Answer

A) I 
B)  II 
C) III 
D) II and III 
E)  I and II 
A) I 
B)  II 
C) III 
D) II and III 
E)  I and II

Question 7

A compound with molecular formula C6H12O displays the following IR, 1H NMR and 13C NMR spectra. Propose a structure for this compound.

Accepted Answer

Question 8

A compound with molecular formula C6H4Cl2O displays the following IR, 1H NMR and 13C NMR spectra. Propose a structure for this compound.

Accepted Answer

Question 9

In an NMR spectrometer, the receiver coil records a complex signal, called a ________________, which is converted into a spectrum via a mathematical technique called a ____________________.

Accepted Answer

free induction decay

Question 10

Identify the splitting pattern for a CH2 in an off-resonance decoupled 13C NMR spectrum.

Accepted Answer

A)  no peak 
B)  singlet 
C)  doublet 
D)  triplet 
E)  quartet 
A)  no peak 
B)  singlet 
C)  doublet 
D)  triplet 
E)  quartet

Question 11

Which of the following Jab values is consistent with the following structure?

Accepted Answer

A)  1.2 Hz 
B)  6.5 Hz 
C)  17 Hz 
D)  20 Hz 
E)  11 Hz 
A)  1.2 Hz 
B)  6.5 Hz 
C)  17 Hz 
D)  20 Hz 
E)  11 Hz

Question 12

Which of the following electromagnetic radiation is used in NMR spectroscopy?

Accepted Answer

A)  UV 
B)  IR 
C)  visible 
D)  γ-rays 
E)  radio wave 
A)  UV 
B)  IR 
C)  visible 
D)  γ-rays 
E)  radio wave

Question 13

A compound, with molecular formula C7H7Br, displays the following 13C NMR along with the DEPT-90 and DEPT-135 13C NMR spectra. What is the structure for this compound?

Accepted Answer

Question 14

Which of the following compounds is consistent with the 13C NMR spectrum shown below?

Accepted Answer

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

Question 15

Which of the following compounds, with molecular formula C9H12O, is consistent with the 1H NMR and 13C NMR spectra shown below?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  None of these 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  None of these

Question 16

Identify the splitting pattern for a C in a carbonyl group in an off-resonance decoupled 13C NMR spectrum.

Accepted Answer

A)  no peak 
B)  singlet 
C)  doublet 
D)  triplet 
E)  quartet 
A)  no peak 
B)  singlet 
C)  doublet 
D)  triplet 
E)  quartet

Question 17

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

Accepted Answer

A)  I - 5, II - 8 
B)  I - 3, II - 6 
C)  I - 4, II - 8 
D)  I - 5, II - 6 
E)  I - 3, II - 3 
A)  I - 5, II - 8 
B)  I - 3, II - 6 
C)  I - 4, II - 8 
D)  I - 5, II - 6 
E)  I - 3, II - 3

Question 18

Which of the following compounds will display five signals in its 13C 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 19

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

Accepted Answer

Question 20

Which of the following Jac values is consistent with the following structure?

Accepted Answer

A)  1.2 Hz 
B)  6.5 Hz 
C)  17 Hz 
D)  20 Hz 
E)  11 Hz 
A)  1.2 Hz 
B)  6.5 Hz 
C)  17 Hz 
D)  20 Hz 
E)  11 Hz

Exam 15: Nuclear Magnetic Resonance Spectroscopy

Protons Ha and Hb in the following compound are _________.

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

A compound with a molecular formula of C10H12O2 has the following 1H NMR spectrum. Which of the following structures is consistent with this spectrum? SHAPE \* MERGEFORMAT

An unknown compound displays the following IR, 1H NMR, 13C NMR and.mass spectra. Propose a structure for this compound. SDBS

A compound, with molecular formula C11H14O, displays the following IR, 1H NMR and 13C NMR spectra. Propose a structure for this compound.

Which of the following compounds will not display a carbonyl carbon signal in the DEPT-90 and DEPT-135 13C NMR spectroscopy?

A compound with molecular formula C6H12O displays the following IR, 1H NMR and 13C NMR spectra. Propose a structure for this compound.

A compound with molecular formula C6H4Cl2O displays the following IR, 1H NMR and 13C NMR spectra. Propose a structure for this compound.

In an NMR spectrometer, the receiver coil records a complex signal, called a ________________, which is converted into a spectrum via a mathematical technique called a ____________________.

Identify the splitting pattern for a CH2 in an off-resonance decoupled 13C NMR spectrum.

Which of the following Jab values is consistent with the following structure?

Which of the following electromagnetic radiation is used in NMR spectroscopy?

A compound, with molecular formula C7H7Br, displays the following 13C NMR along with the DEPT-90 and DEPT-135 13C NMR spectra. What is the structure for this compound?

Which of the following compounds is consistent with the 13C NMR spectrum shown below?

Which of the following compounds, with molecular formula C9H12O, is consistent with the 1H NMR and 13C NMR spectra shown below?

Identify the splitting pattern for a C in a carbonyl group in an off-resonance decoupled 13C NMR spectrum.

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

Which of the following compounds will display five signals in its 13C NMR spectrum?

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

Which of the following Jac values is consistent with the following structure?

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

Protons H_a and H_b in the following compound are _________.

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

An unknown compound displays the following IR, ¹H NMR, ¹³C NMR and.mass spectra. Propose a structure for this compound. SDBS

A compound, with molecular formula C₁₁H₁₄O, displays the following IR, ¹H NMR and ¹³C NMR spectra. Propose a structure for this compound.

Which of the following compounds will not display a carbonyl carbon signal in the DEPT-90 and DEPT-135 ¹³C NMR spectroscopy?

A compound with molecular formula C₆H₁₂O displays the following IR, ¹H NMR and ¹³C NMR spectra. Propose a structure for this compound.

A compound with molecular formula C₆H₄Cl₂O displays the following IR, ¹H NMR and ¹³C NMR spectra. Propose a structure for this compound.

In an NMR spectrometer, the receiver coil records a complex signal, called a , which is converted into a spectrum via a mathematical technique called a ____.

Identify the splitting pattern for a CH₂ in an off-resonance decoupled ¹³C NMR spectrum.

Which of the following J_ab values is consistent with the following structure?

A compound, with molecular formula C₇H₇Br, displays the following ¹³C NMR along with the DEPT-90 and DEPT-135 ¹³C NMR spectra. What is the structure for this compound?

Which of the following compounds is consistent with the ¹³C NMR spectrum shown below?

Which of the following compounds, with molecular formula C₉H₁₂O, is consistent with the ¹H NMR and ¹³C NMR spectra shown below?

Identify the splitting pattern for a C in a carbonyl group in an off-resonance decoupled ¹³C NMR spectrum.

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

Which of the following compounds will display five signals in its ¹³C NMR spectrum?

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

Which of the following J_ac values is consistent with the following structure?