Question 1

Match the following aliphatic molecules to their infrared carbonyl stretching frequency:
 -1 A)  A B)  C C)  D D)  B" class="answers-bank-image d-inline" rel="preload" >
-1650 cm-1

Accepted Answer

A)   A
B)   C
C)   D
D)   BE) A) and D)
F) A) and C)

Question 2

From the following molecules, pick out those which do not have four proton signals in their 1H NMR spectrum. Please select all that apply.
1H NMR spectrum. Please select all that apply.   A)  A. B)  B. C)  C. D)  D. E)  E." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   A.
B)   B.
C)   C.
D)   D.
E)   E.F) C) and E)
G) A) and D)

Question 3

From the following molecules, pick out those which have six carbon signals in their 13C NMR spectrum. Please select all that apply.
13C NMR spectrum. Please select all that apply.   A)  A. B)  B. C)  C. D)  D. E)  E." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   A.
B)   B.
C)   C.
D)   D.
E)   E.F) B) and C)
G) B) and D)

Question 4

Match the following molecular formulae to the mass spectra A-C:
 8H9NOCl A)  B B)  C C)  A" class="answers-bank-image d-inline" rel="preload" >
-C8H9NOCl

Accepted Answer

A)   B
B)   C
C)   AD) All of the above
E) B) and C)

Question 5

Match the following aliphatic molecules to their infrared carbonyl stretching frequency:
 -1 A)  A B)  C C)  D D)  B" class="answers-bank-image d-inline" rel="preload" >
-1815 cm-1

Accepted Answer

A)   A
B)   C
C)   D
D)   BE) None of the above
F) B) and C)

Question 6

The following molecules were examined by 1H NMR spectroscopy. Rank them in order of decreasing chemical shift for their methyl group (where 1 indicates the largest ppm and 3 indicates the smallest ppm) :
1H NMR spectroscopy. Rank them in order of decreasing chemical shift for their methyl group (where 1 indicates the largest ppm and 3 indicates the smallest ppm) :   A)  Molecule A B)  Molecule B C)  Molecule C" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   Molecule A
B)   Molecule B
C)   Molecule CD) B) and C)
E) All of the above

Question 7

Pick out the isotopic distribution pattern for 2-phenylpropanoic acid (hint: 1.1% of all carbon atoms have an atomic mass of 13) .

Accepted Answer

A)   150 (M, 100%) , 151 (1%) , 152 (0.01%) .
B)   150 (M, 100%) , 151 (5%) , 152 (0.05%) .
C)   150 (M, 100%) , 151 (10%) , 152 (0.1%) .
D)   150 (M, 100%) , 151 (20%) , 152 (0.2%) .E) A) and D)
F) B) and C)

Question 8

How many degrees of unsaturation are there in a compound with the molecular formula C6H10NOCl?

Accepted Answer

A)   1.
B)   2.
C)   3.
D)   4.
E)   5.F) B) and E)
G) C) and D)

Question 9

Pick out the molecular ion peak for a molecule containing a single nitrogen atom.

Accepted Answer

A)   84.
B)   93.
C)   108.
D)   114.E) B) and C)
F) A) and D)

Question 10

How many magnetically non-equivalent carbon atoms are there in the following molecule?

Accepted Answer

A)   5.
B)   8.
C)   4.
D)   6.E) A) and D)
F) A) and B)

Exam 12: Molecular Characterisation

Match the following aliphatic molecules to their infrared carbonyl stretching frequency: -1815 cm^-1

Correct Answer
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Match the following molecular formulae to the mass spectra A-C: -C₈H₉NOCl

Correct Answer
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From the following molecules, pick out those which do not have four proton signals in their ¹H NMR spectrum. Please select all that apply.

Correct Answer
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Pick out the molecular ion peak for a molecule containing a single nitrogen atom.

Correct Answer
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How many magnetically non-equivalent carbon atoms are there in the following molecule?

Correct Answer
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The following molecules were examined by ¹H NMR spectroscopy. Rank them in order of decreasing chemical shift for their methyl group (where 1 indicates the largest ppm and 3 indicates the smallest ppm) :

Correct Answer
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Match the following aliphatic molecules to their infrared carbonyl stretching frequency: -1650 cm^-1

Correct Answer
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From the following molecules, pick out those which have six carbon signals in their ¹³C NMR spectrum. Please select all that apply.

Correct Answer
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Pick out the isotopic distribution pattern for 2-phenylpropanoic acid (hint: 1.1% of all carbon atoms have an atomic mass of 13) .

Correct Answer
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How many degrees of unsaturation are there in a compound with the molecular formula C₆H₁₀NOCl?

Correct Answer
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Exam 12: Molecular Characterisation

Match the following aliphatic molecules to their infrared carbonyl stretching frequency: -1815 cm-1

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Match the following molecular formulae to the mass spectra A-C: -C8H9NOCl

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From the following molecules, pick out those which do not have four proton signals in their 1H NMR spectrum. Please select all that apply.

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Pick out the molecular ion peak for a molecule containing a single nitrogen atom.

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How many magnetically non-equivalent carbon atoms are there in the following molecule?

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The following molecules were examined by 1H NMR spectroscopy. Rank them in order of decreasing chemical shift for their methyl group (where 1 indicates the largest ppm and 3 indicates the smallest ppm) :

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Match the following aliphatic molecules to their infrared carbonyl stretching frequency: -1650 cm-1

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From the following molecules, pick out those which have six carbon signals in their 13C NMR spectrum. Please select all that apply.

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Pick out the isotopic distribution pattern for 2-phenylpropanoic acid (hint: 1.1% of all carbon atoms have an atomic mass of 13) .

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How many degrees of unsaturation are there in a compound with the molecular formula C6H10NOCl?

Correct AnswerverifiedShow Answer

Match the following aliphatic molecules to their infrared carbonyl stretching frequency: -1815 cm^-1

Correct Answer
verified

Match the following molecular formulae to the mass spectra A-C: -C₈H₉NOCl

Correct Answer
verified

From the following molecules, pick out those which do not have four proton signals in their ¹H NMR spectrum. Please select all that apply.

Correct Answer
verified

Correct Answer
verified

Correct Answer
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The following molecules were examined by ¹H NMR spectroscopy. Rank them in order of decreasing chemical shift for their methyl group (where 1 indicates the largest ppm and 3 indicates the smallest ppm) :

Correct Answer
verified

Match the following aliphatic molecules to their infrared carbonyl stretching frequency: -1650 cm^-1

Correct Answer
verified

From the following molecules, pick out those which have six carbon signals in their ¹³C NMR spectrum. Please select all that apply.

Correct Answer
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Correct Answer
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How many degrees of unsaturation are there in a compound with the molecular formula C₆H₁₀NOCl?

Correct Answer
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