Question 1

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 = 4 
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 = 4 C

Question 2

Which of the following compounds would give rise to a 13C spectrum with 6 peaks?

Accepted Answer

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

Question 3

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 
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 A

Question 4

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 
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

Question 5

Which of the indicated protons absorbs furthest downfield?

Accepted Answer

A) Ha 
B) Hb 
C) Hc 
D) Hd 
A) Ha 
B) Hb 
C) Hc 
D) Hd

Question 6

Compound X has a molecular formula C8H10 and gives the 1H NMR spectrum below.What is the structure of X?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Question 7

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

Accepted Answer

A) I = 6; II = 2; III = 3 
B) I = 7; II = 3; III = 3 
C) I = 7; II = 1; III = 3 
D) I = 7; II = 2; III = 3 
A) I = 6; II = 2; III = 3 
B) I = 7; II = 3; III = 3 
C) I = 7; II = 1; III = 3 
D) I = 7; II = 2; III = 3

Question 8

An unknown compound X has the molecular formula C7H13OBr.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?

Accepted Answer

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

Question 9

What region of the electromagnetic spectrum does nuclear magnet resonance spectroscopy use?

Accepted Answer

A) Radio frequency 
B) Microwave frequency 
C) Infrared frequency 
D) Visible frequency 
E) Ultraviolet frequency 
A) Radio frequency 
B) Microwave frequency 
C) Infrared frequency 
D) Visible frequency 
E) Ultraviolet frequency

Question 10

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?

Accepted Answer

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

Question 11

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: 5 
A) a: 5; b: 6 
B) a: 5; b: 5 
C) a: 4; b: 6 
D) a: 4; b: 5

Question 12

Which of the following statements is true about electromagnetic radiation?

Accepted Answer

A) All molecules absorb electromagnetic radiation at some frequency. 
B) Frequency is directly proportional to wavelength. 
C) NMR uses the microwave region of the electromagnetic spectrum. 
D) The radio frequency region of the electromagnetic spectrum has the largest energy per photon. 
E) Energy is inversely proportional to frequency. 
A) All molecules absorb electromagnetic radiation at some frequency. 
B) Frequency is directly proportional to wavelength. 
C) NMR uses the microwave region of the electromagnetic spectrum. 
D) The radio frequency region of the electromagnetic spectrum has the largest energy per photon. 
E) Energy is inversely proportional to frequency.

Question 13

What effect does increasing the operating frequency of a 1H NMR spectrum have on the frequency of an absorption in Hz?

Accepted Answer

A) Frequency of an absorption in Hz will also increase. 
B) Frequency of an absorption in Hz will decrease. 
C) Frequency of an absorption in Hz will remain the same. 
D) It is not possible to predict the change in frequency of an absorption in Hz. 
A) Frequency of an absorption in Hz will also increase. 
B) Frequency of an absorption in Hz will decrease. 
C) Frequency of an absorption in Hz will remain the same. 
D) It is not possible to predict the change in frequency of an absorption in Hz.

Question 14

An unknown compound A has the molecular formula C12H16O.Compound A absorbs strongly in the IR at 1700 cm-1.The NMR spectral data for compound A are given below.What is the structure of compound A?

Accepted Answer

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

Question 15

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?

Accepted Answer

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

Question 16

Which of the labeled protons absorbs furthest upfield in the 1H NMR spectrum?

Accepted Answer

A) Ha 
B) Hb 
C) Hc 
D) Hd 
A) Ha 
B) Hb 
C) Hc 
D) Hd

Question 17

Which of the following spectroscopy methods does not involve the interaction of organic molecules with electromagnetic radiation?

Accepted Answer

A) Nuclear magnetic resonance 
B) Infrared spectroscopy 
C) Mass spectrometry 
D) Ultraviolet spectroscopy 
A) Nuclear magnetic resonance 
B) Infrared spectroscopy 
C) Mass spectrometry 
D) Ultraviolet spectroscopy

Question 18

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

Accepted Answer

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

Question 19

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

Accepted Answer

A) I = 2; II = 3; III = 4 
B) I = 2; II = 3; III = 3 
C) I = 3; II = 3; III = 3 
D) I = 3; II = 3; III = 4 
A) I = 2; II = 3; III = 4 
B) I = 2; II = 3; III = 3 
C) I = 3; II = 3; III = 3 
D) I = 3; II = 3; III = 4

Question 20

Into how many peaks will the circled proton be split?

Accepted Answer

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

Exam 32: Organic Spectroscopy Concepts

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

Which of the following compounds would give rise to a 13C spectrum with 6 peaks?

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

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

Which of the indicated protons absorbs furthest downfield?

Compound X has a molecular formula C8H10 and gives the 1H NMR spectrum below.What is the structure of X?

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

An unknown compound X has the molecular formula C7H13OBr.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?

What region of the electromagnetic spectrum does nuclear magnet resonance spectroscopy use?

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?

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

Which of the following statements is true about electromagnetic radiation?

What effect does increasing the operating frequency of a 1H NMR spectrum have on the frequency of an absorption in Hz?

An unknown compound A has the molecular formula C12H16O.Compound A absorbs strongly in the IR at 1700 cm-1.The NMR spectral data for compound A are given below.What is the structure of compound A?

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?

Which of the labeled protons absorbs furthest upfield in the 1H NMR spectrum?

Which of the following spectroscopy methods does not involve the interaction of organic molecules with electromagnetic radiation?

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

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

Into how many peaks will the circled proton be split?

Structure and Bonding

Acids and Bases

Introduction to Organic Molecules and Functional Groups

Alkanes

Stereochemistry

Understanding Organic Reactions

Alkyl Halides and Nucleophilic Substitution

Alkyl Halides and Elimination Reactions

Alcohols,ethers,and Related Compounds

Alkenes and Addition Reactions

Alkynes and Synthesis

Oxidation and Reduction

Radical Reactions

Conjugation, resonance, and Dienes

Benzene and Aromatic Compounds

Reactions of Aromatic Compounds

Introduction to Carbonyl Chemistry; Organometallic Reagents; Oxidation and Reduction

Aldehydes and Ketones - Nucleophilic Addition

Carboxylic Acids and the Acidity of the O-H Bond

Carboxylic Acids and Their Derivatives - Nucleophilic Acyl Substitution

Substitution Reactions of Carbonyl Compounds at the a Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond-Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Amino Acids and Proteins

Synthetic Polymers

Lipids

Molecular Ion Peaks and Fragmentation Patterns

Analyzing Molecular Motion and Infrared Spectroscopy

Filters

Which of the following compounds would give rise to a ¹³C spectrum with 6 peaks?

Compound X has a molecular formula C₈H₁₀ and gives the ¹H NMR spectrum below.What is the structure of X?

An unknown compound X has the molecular formula C₇H₁₃OBr.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?

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?

What effect does increasing the operating frequency of a ¹H NMR spectrum have on the frequency of an absorption in Hz?

An unknown compound A has the molecular formula C₁₂H₁₆O.Compound A absorbs strongly in the IR at 1700 cm^-1.The NMR spectral data for compound A are given below.What is the structure of compound A?

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?

Which of the labeled protons absorbs furthest upfield in the ¹H NMR spectrum?

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