Question 1

How many peaks would you expect in the proton decoupled 13C NMR spectrum of 2-pentanol?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5

Question 2

Which of the following forms of electromagnetic radiation has the longest wavelength?

Accepted Answer

A)   radiowaves
B)   infrared
C)   visible
D)   uv
E)   x-ray

Question 3

An IR spectrum of an unknown organic molecule having the formula C3H6O2 reveals strong absorptions at 2500-3400 cm-1, 1715 cm-1, and 1230 cm-1.To what class of compounds does the unknown belong?

Accepted Answer

A)   alcohol
B)   carboxylic acid
C)   aldehyde
D)   ester
E)   ether

Question 4

As the wavelength of the radiation increases, the _______ decreases.

Accepted Answer

A)   energy
B)   frequency
C)   wave number
D)   all of these
E)   all increase

Question 5

An unknown hydrocarbon shows a parent peak on its mass spectra at m/z 86.There is no evidence of absorptions from visible or uv spectra.The IR shows no major absorptions outside the C-H stretch and bending vibrations.The 1H NMR reveals a singlet at  δ \delta δ  0.9 (9H) , a triplet at  δ \delta δ  0.98 (3H) , and a quartet at  δ \delta δ  1.6 (2H) .

Accepted Answer

A)   1H NMR reveals a singlet at   \delta   0.9 (9H) , a triplet at   \delta   0.98 (3H) , and a quartet at   \delta   1.6 (2H) . 
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
B)   1H NMR reveals a singlet at   \delta   0.9 (9H) , a triplet at   \delta   0.98 (3H) , and a quartet at   \delta   1.6 (2H) . 
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
C)   1H NMR reveals a singlet at   \delta   0.9 (9H) , a triplet at   \delta   0.98 (3H) , and a quartet at   \delta   1.6 (2H) . 
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
D)   1H NMR reveals a singlet at   \delta   0.9 (9H) , a triplet at   \delta   0.98 (3H) , and a quartet at   \delta   1.6 (2H) . 
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
E)   1H NMR reveals a singlet at   \delta   0.9 (9H) , a triplet at   \delta   0.98 (3H) , and a quartet at   \delta   1.6 (2H) . 
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >

Question 6

The compound 1H decoupled 13C NMR spectrum? A)  3 B)  4 C)  5 D)  6 E)  9" class="answers-bank-image d-inline" rel="preload" > will show what number of peaks in its 1H decoupled 13C NMR spectrum?

Accepted Answer

A)   3
B)   4
C)   5
D)   6
E)   9

Question 7

The IR spectrum stretching frequency that has the highest energy occurs for which of these bonds?

Accepted Answer

A)   O-H
B)   C-O
C)   C-Cl
D)   C-H
E)   C-C

Question 8

The mass spectrum of 1-pentanol shows an intense daughter ion peak at m/z = 31.This peak could be due to the formation of:

Accepted Answer

A)   C5H12O•
B)   C3H7O+
C)   CH3O+
D)   CH4O•
E)   C4H10O+

Question 9

An IR spectrum of an unknown organic molecule having the formula C2H4O reveals a strong absorption at 1715-1725 cm-1.To what class of compounds does the unknown belong?

Accepted Answer

A)   alcohol
B)   amine
C)   aldehyde
D)   alkyne
E)   ether

Question 10

How many peak(s)  would you expect to see in the 1H NMR spectrum of 1-bromobutane?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   more than 4

Question 11

An unknown oxygen-containing organic molecule shows a parent peak on its mass spectra at m/z 122.With no information from the visible or uv, the IR revealed major broad absorptions from 2500 cm-1 to 3500 cm-1, and strong sharp absorptions at 2930 cm-1, 1690 cm-1, and 1230 cm-1.The 1H NMR revealed a singlet downfield around  δ \delta δ  13 (1H)  and a multiplet at  δ \delta δ  7.2 (5H) .The molecule consistent with these facts is:

Accepted Answer

A)   -1 to 3500 cm-1, and strong sharp absorptions at 2930 cm-1, 1690 cm-1, and 1230 cm-1.The 1H NMR revealed a singlet downfield around   \delta   13 (1H)  and a multiplet at   \delta   7.2 (5H) .The molecule consistent with these facts is: 
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
B)   -1 to 3500 cm-1, and strong sharp absorptions at 2930 cm-1, 1690 cm-1, and 1230 cm-1.The 1H NMR revealed a singlet downfield around   \delta   13 (1H)  and a multiplet at   \delta   7.2 (5H) .The molecule consistent with these facts is: 
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
C)   -1 to 3500 cm-1, and strong sharp absorptions at 2930 cm-1, 1690 cm-1, and 1230 cm-1.The 1H NMR revealed a singlet downfield around   \delta   13 (1H)  and a multiplet at   \delta   7.2 (5H) .The molecule consistent with these facts is: 
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
D)   -1 to 3500 cm-1, and strong sharp absorptions at 2930 cm-1, 1690 cm-1, and 1230 cm-1.The 1H NMR revealed a singlet downfield around   \delta   13 (1H)  and a multiplet at   \delta   7.2 (5H) .The molecule consistent with these facts is: 
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
E)   -1 to 3500 cm-1, and strong sharp absorptions at 2930 cm-1, 1690 cm-1, and 1230 cm-1.The 1H NMR revealed a singlet downfield around   \delta   13 (1H)  and a multiplet at   \delta   7.2 (5H) .The molecule consistent with these facts is: 
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >

Question 12

Which of the following compounds will have two peaks in its 1H NMR spectrum and a broad band in the 3200 to 3500 cm-1 region of its IR spectrum?

Accepted Answer

A)   1H NMR spectrum and a broad band in the 3200 to 3500 cm-1 region of its IR spectrum? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
B)   1H NMR spectrum and a broad band in the 3200 to 3500 cm-1 region of its IR spectrum? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
C)   1H NMR spectrum and a broad band in the 3200 to 3500 cm-1 region of its IR spectrum? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   1H NMR spectrum and a broad band in the 3200 to 3500 cm-1 region of its IR spectrum? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   1H NMR spectrum and a broad band in the 3200 to 3500 cm-1 region of its IR spectrum? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >

Question 13

A monochloroalkane shows two parent ion peaks m/z at 92 and 94.What is the molecular formula?

Accepted Answer

A)   C4H9Cl
B)   C3H7Cl
C)   C3H21Cl
D)   C4H7Cl
E)   C2H6Cl

Question 14

Which of the following forms of electromagnetic radiation has the highest energy?

Accepted Answer

A)   radiowaves
B)   infrared
C)   visible
D)   uv
E)   x-ray

Question 15

Which compound has five singlets in its proton-decoupled 13C NMR spectrum and two quartets, one triplet, one doublet, and one singlet in its proton-coupled 13C NMR spectrum?

Accepted Answer

A)   13C NMR spectrum and two quartets, one triplet, one doublet, and one singlet in its proton-coupled 13C NMR spectrum? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
B)   13C NMR spectrum and two quartets, one triplet, one doublet, and one singlet in its proton-coupled 13C NMR spectrum? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
C)   13C NMR spectrum and two quartets, one triplet, one doublet, and one singlet in its proton-coupled 13C NMR spectrum? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   13C NMR spectrum and two quartets, one triplet, one doublet, and one singlet in its proton-coupled 13C NMR spectrum? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   13C NMR spectrum and two quartets, one triplet, one doublet, and one singlet in its proton-coupled 13C NMR spectrum? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >

Question 16

Which bond would show a strong, sharp absorption in the IR between 1200 and 1000 cm-1?

Accepted Answer

A)   O-H
B)   N-H
C)   C=O
D)   C-H
E)   C-O

Question 17

An IR spectrum of an unknown organic molecule having the formula C3H6O reveals a strong absorption at 1230 cm-1 and has no absorption over 3000 cm-1.To what class of compounds does the unknown belong?

Accepted Answer

A)   alcohol
B)   amine
C)   aldehyde
D)   alkyne
E)   ether

Question 18

Which bond would show a sharp absorption in the IR between 3000 and 2800 cm-1?

Accepted Answer

A)   O-H
B)   N-H
C)   C=O
D)   C-H
E)   C-O

Question 19

An unknown oxygen containing organic molecule shows a parent peak in its mass spectrum at m/z 58.There is no measurable uv or visible spectrum.The IR shows strong, sharp absorptions at 2930 cm-1 and 1725 cm-1.The 1H NMR shows a singlet at  δ \delta δ  2.1 (6H) .Which of the following structures best fits the spectral data?

Accepted Answer

A)   -1 and 1725 cm-1.The 1H NMR shows a singlet at   \delta   2.1 (6H) .Which of the following structures best fits the spectral data? 
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
B)   -1 and 1725 cm-1.The 1H NMR shows a singlet at   \delta   2.1 (6H) .Which of the following structures best fits the spectral data? 
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
C)   -1 and 1725 cm-1.The 1H NMR shows a singlet at   \delta   2.1 (6H) .Which of the following structures best fits the spectral data? 
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
D)   -1 and 1725 cm-1.The 1H NMR shows a singlet at   \delta   2.1 (6H) .Which of the following structures best fits the spectral data? 
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
E)   -1 and 1725 cm-1.The 1H NMR shows a singlet at   \delta   2.1 (6H) .Which of the following structures best fits the spectral data? 
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >

Question 20

Which of the following molecules shows only one singlet in its 1H NMR spectrum? 1H NMR spectrum?   A)  I B)  II C)  I and III D)  IV E)  V" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

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

Exam 12: Spectroscopy and Structure Determination

Correct Answer
verified

Which compound has five singlets in its proton-decoupled ¹³C NMR spectrum and two quartets, one triplet, one doublet, and one singlet in its proton-coupled ¹³C NMR spectrum?

Correct Answer
verified

As the wavelength of the radiation increases, the _______ decreases.

Correct Answer
verified

How many peaks would you expect in the proton decoupled ¹³C NMR spectrum of 2-pentanol?

Correct Answer
verified

Which of the following forms of electromagnetic radiation has the highest energy?

Correct Answer
verified

Which bond would show a strong, sharp absorption in the IR between 1200 and 1000 cm^-¹?

Correct Answer
verified

The compound will show what number of peaks in its ¹H decoupled ¹³C NMR spectrum?

Correct Answer
verified

A monochloroalkane shows two parent ion peaks m/z at 92 and 94.What is the molecular formula?

Correct Answer
verified

Correct Answer
verified

The IR spectrum stretching frequency that has the highest energy occurs for which of these bonds?

Correct Answer
verified

Which bond would show a sharp absorption in the IR between 3000 and 2800 cm^-¹?

Correct Answer
verified

Correct Answer
verified

Which of the following forms of electromagnetic radiation has the longest wavelength?

Correct Answer
verified

Which of the following compounds will have two peaks in its ¹H NMR spectrum and a broad band in the 3200 to 3500 cm^-¹ region of its IR spectrum?

Correct Answer
verified

How many peak(s) would you expect to see in the ¹H NMR spectrum of 1-bromobutane?

Correct Answer
verified

Which of the following molecules shows only one singlet in its ¹H NMR spectrum?

Correct Answer
verified

An IR spectrum of an unknown organic molecule having the formula C₃H₆O₂ reveals strong absorptions at 2500-3400 cm^-¹, 1715 cm^-¹, and 1230 cm^-¹.To what class of compounds does the unknown belong?

Correct Answer
verified

An IR spectrum of an unknown organic molecule having the formula C₃H₆O reveals a strong absorption at 1230 cm^-¹ and has no absorption over 3000 cm^-¹.To what class of compounds does the unknown belong?

Correct Answer
verified

An IR spectrum of an unknown organic molecule having the formula C₂H₄O reveals a strong absorption at 1715-1725 cm^-¹.To what class of compounds does the unknown belong?

Correct Answer
verified

The mass spectrum of 1-pentanol shows an intense daughter ion peak at m/z = 31.This peak could be due to the formation of:

Correct Answer
verified

Exam 12: Spectroscopy and Structure Determination

Correct AnswerverifiedShow Answer

Which compound has five singlets in its proton-decoupled 13C NMR spectrum and two quartets, one triplet, one doublet, and one singlet in its proton-coupled 13C NMR spectrum?

Correct AnswerverifiedShow Answer

As the wavelength of the radiation increases, the _______ decreases.

Correct AnswerverifiedShow Answer

How many peaks would you expect in the proton decoupled 13C NMR spectrum of 2-pentanol?

Correct AnswerverifiedShow Answer

Which of the following forms of electromagnetic radiation has the highest energy?

Correct AnswerverifiedShow Answer

Which bond would show a strong, sharp absorption in the IR between 1200 and 1000 cm-1?

Correct AnswerverifiedShow Answer

The compound will show what number of peaks in its 1H decoupled 13C NMR spectrum?

Correct AnswerverifiedShow Answer

A monochloroalkane shows two parent ion peaks m/z at 92 and 94.What is the molecular formula?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The IR spectrum stretching frequency that has the highest energy occurs for which of these bonds?

Correct AnswerverifiedShow Answer

Which bond would show a sharp absorption in the IR between 3000 and 2800 cm-1?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following forms of electromagnetic radiation has the longest wavelength?

Correct AnswerverifiedShow Answer

Which of the following compounds will have two peaks in its 1H NMR spectrum and a broad band in the 3200 to 3500 cm-1 region of its IR spectrum?

Correct AnswerverifiedShow Answer

How many peak(s) would you expect to see in the 1H NMR spectrum of 1-bromobutane?

Correct AnswerverifiedShow Answer

Which of the following molecules shows only one singlet in its 1H NMR spectrum?

Correct AnswerverifiedShow Answer

An IR spectrum of an unknown organic molecule having the formula C3H6O2 reveals strong absorptions at 2500-3400 cm-1, 1715 cm-1, and 1230 cm-1.To what class of compounds does the unknown belong?

Correct AnswerverifiedShow Answer

An IR spectrum of an unknown organic molecule having the formula C3H6O reveals a strong absorption at 1230 cm-1 and has no absorption over 3000 cm-1.To what class of compounds does the unknown belong?

Correct AnswerverifiedShow Answer

An IR spectrum of an unknown organic molecule having the formula C2H4O reveals a strong absorption at 1715-1725 cm-1.To what class of compounds does the unknown belong?

Correct AnswerverifiedShow Answer

The mass spectrum of 1-pentanol shows an intense daughter ion peak at m/z = 31.This peak could be due to the formation of:

Correct AnswerverifiedShow Answer

Correct Answer
verified

Which compound has five singlets in its proton-decoupled ¹³C NMR spectrum and two quartets, one triplet, one doublet, and one singlet in its proton-coupled ¹³C NMR spectrum?

Correct Answer
verified

Correct Answer
verified

How many peaks would you expect in the proton decoupled ¹³C NMR spectrum of 2-pentanol?

Correct Answer
verified

Correct Answer
verified

Which bond would show a strong, sharp absorption in the IR between 1200 and 1000 cm^-¹?

Correct Answer
verified

The compound will show what number of peaks in its ¹H decoupled ¹³C NMR spectrum?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which bond would show a sharp absorption in the IR between 3000 and 2800 cm^-¹?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which of the following compounds will have two peaks in its ¹H NMR spectrum and a broad band in the 3200 to 3500 cm^-¹ region of its IR spectrum?

Correct Answer
verified

How many peak(s) would you expect to see in the ¹H NMR spectrum of 1-bromobutane?

Correct Answer
verified

Which of the following molecules shows only one singlet in its ¹H NMR spectrum?

Correct Answer
verified

An IR spectrum of an unknown organic molecule having the formula C₃H₆O₂ reveals strong absorptions at 2500-3400 cm^-¹, 1715 cm^-¹, and 1230 cm^-¹.To what class of compounds does the unknown belong?

Correct Answer
verified

An IR spectrum of an unknown organic molecule having the formula C₃H₆O reveals a strong absorption at 1230 cm^-¹ and has no absorption over 3000 cm^-¹.To what class of compounds does the unknown belong?

Correct Answer
verified

An IR spectrum of an unknown organic molecule having the formula C₂H₄O reveals a strong absorption at 1715-1725 cm^-¹.To what class of compounds does the unknown belong?

Correct Answer
verified

Correct Answer
verified