Question 1

Why KBr and NaCl are used for sample preparation in the infrared spectroscopic analysis of compounds?

Accepted Answer

KBr and NaCl are used for samp...

Question 2

MATCH a structure from the list below to the following IR spectra. Place the letter of the structure in the blank provided.
-_____  Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/

Accepted Answer

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

Question 3

MATCH each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. Place the letter of the region in the blank to the left of the bond-type.
-_____ triple bond stretching vibrations.

Accepted Answer

A)  4000 to 2500 cm−1
B)  2500 to 2000 cm−1
C)  2000 to 1500 cm−1
D)  below 1500 cm−1E) B) and D)
F) A) and C)

Question 4

Which of the following laws relates the frequency of a stretching vibration to the masses and spring constant of a simple harmonic oscillator?

Accepted Answer

A)   Pan's law
B)   Hooke's law
C)   Peter's law
D)   Barrie's lawE) A) and C)
F) C) and D)

Question 5

Which of the following bonds undergoes stretching at the highest frequency?

Accepted Answer

A)   C=O
B)   C−O
C)   C=C
D)   C−CE) B) and C)
F) A) and C)

Question 6

Which of the following compounds does not give an infrared spectrum with peak at ∼1750 cm−1? ​ 1? ​   ​ A)  1 B)  2 C)  3 D)  4" class="answers-bank-image d-inline" rel="preload" > ​

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) None of the above
F) All of the above

Question 7

Which of the following bonds gives rise to a medium strength absorbance at approximately 1600-1680 cm−1 in the infrared spectrum?

Accepted Answer

A)   C−H
B)   C−C
C)   C=C
D)   C≡CE) A) and B)
F) B) and C)

Question 8

The given molecule shows a stretching absorption peak at 2200-2250 cm−1 due to the presence of a _____. ​ −1 due to the presence of a _____. ​   A)  nitrile functional group B)  hydroxyl functional group C)  carbon-carbon double bond D)  carbon-carbon single bond" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   nitrile functional group
B)   hydroxyl functional group
C)   carbon-carbon double bond
D)   carbon-carbon single bondE) A) and B)
F) A) and C)

Question 9

Which of the following bonds undergoes stretching at the highest frequency?

Accepted Answer

A)   O−H
B)   C−H
C)   C=O
D)   C≡CE) A) and B)
F) A) and C)

Question 10

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 3200-3650 cm−1 (strong) , but does not have peaks at 1630-1820 or 1000-1250 cm−1

Accepted Answer

A)   alcohol
B)   aldehyde or ketone
C)   ether
D)   esterE) All of the above
F) None of the above

Question 11

MATCH each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. Place the letter of the region in the blank to the left of the bond-type.
-_____ C=O, C=N, and C=C bond absorptions.

Accepted Answer

A)  4000 to 2500 cm−1
B)  2500 to 2000 cm−1
C)  2000 to 1500 cm−1
D)  below 1500 cm−1E) All of the above
F) C) and D)

Question 12

Which of the following bonds (circled)  gives a very weak or no stretching absorption in the infrared spectrum?

Accepted Answer

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

Question 13

What range of wavelengths corresponds to the infrared region of the electromagnetic spectrum?

Accepted Answer

A)   200-400 nm
B)   400-700 nm
C)   2.5-50 μm
D)   2-10 mmE) A) and D)
F) B) and C)

Question 14

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) , but does not have peaks at 1630-1820 (strong)  or 1600-1640 cm−1 (medium) ? 1 (medium) ?   A)  1 B)  2 C)  3 D)  4" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

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

Question 15

The radio wave region of the electromagnetic spectrum would have sufficient energy to produce the following energy transition.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following compounds gives an infrared spectrum with a peak at ∼1750 cm−1, but no significant peaks at 3000-3500 cm−1 or 1050-1250 cm−1? ​ 1, but no significant peaks at 3000-3500 cm−1 or 1050-1250 cm−1? ​   ​ A)  1 B)  2 C)  3 D)  4" class="answers-bank-image d-inline" rel="preload" > ​

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) None of the above
F) A) and B)

Question 17

Which of the following compounds gives an infrared spectrum with a peak in the range of 1630-1820 cm−1 (strong peak) , but does not have peaks at 3200-3650 or 1000-1250 cm−1? 1 (strong peak) , but does not have peaks at 3200-3650 or 1000-1250 cm−1?   A)  1 B)  2 C)  3 D)  4" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

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

Question 18

MATCH each of the following molecules to the region of the infrared spectrum in which they may show a significant absorption. Place the letter of the region in the blank to the left of the bond-type.
-_______ 1 B) 2500 to 2000 cm−1 C) 2000 to 1500 cm−1 D) below 1500 cm−1" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  4000 to 2500 cm−1
B)  2500 to 2000 cm−1
C)  2000 to 1500 cm−1
D)  below 1500 cm−1E) B) and D)
F) B) and C)

Question 19

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad)  and 1600-1640 cm−1 (medium) ; but does not have peaks at 1630-1820 (strong) ? 1 (medium) ; but does not have peaks at 1630-1820 (strong) ?   A)  1 B)  2 C)  3 D)  4" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

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

Question 20

MATCH a structure from the list below to the following IR spectra. Place the letter of the structure in the blank provided.
-_____  Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/

Accepted Answer

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

Exam 12: Infrared Spectroscopy

The radio wave region of the electromagnetic spectrum would have sufficient energy to produce the following energy transition.

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MATCH a structure from the list below to the following IR spectra. Place the letter of the structure in the blank provided. -_____ Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/

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Which of the following bonds undergoes stretching at the highest frequency?

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Which of the following bonds undergoes stretching at the highest frequency?

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MATCH each of the following molecules to the region of the infrared spectrum in which they may show a significant absorption. Place the letter of the region in the blank to the left of the bond-type. -_______

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Which of the following bonds gives rise to a medium strength absorbance at approximately 1600-1680 cm−1 in the infrared spectrum?

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Which of the following compounds does not give an infrared spectrum with peak at ∼1750 cm−1? ​ ​

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Which of the following bonds (circled) gives a very weak or no stretching absorption in the infrared spectrum?

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MATCH each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. Place the letter of the region in the blank to the left of the bond-type. -_____ triple bond stretching vibrations.

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Which of the following compounds gives an infrared spectrum with a peak at ∼1750 cm−1, but no significant peaks at 3000-3500 cm−1 or 1050-1250 cm−1? ​ ​

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Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) and 1600-1640 cm−1 (medium) ; but does not have peaks at 1630-1820 (strong) ?

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MATCH each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. Place the letter of the region in the blank to the left of the bond-type. -_____ C=O, C=N, and C=C bond absorptions.

Correct AnswerverifiedShow Answer

Why KBr and NaCl are used for sample preparation in the infrared spectroscopic analysis of compounds?

Correct AnswerverifiedKBr and NaCl are used for samp...View AnswerShow Answer

MATCH a structure from the list below to the following IR spectra. Place the letter of the structure in the blank provided. -_____ Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/

Correct AnswerverifiedShow Answer

Which of the following laws relates the frequency of a stretching vibration to the masses and spring constant of a simple harmonic oscillator?

Correct AnswerverifiedShow Answer

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 3200-3650 cm−1 (strong) , but does not have peaks at 1630-1820 or 1000-1250 cm−1

Correct AnswerverifiedShow Answer

Which of the following compounds gives an infrared spectrum with a peak in the range of 1630-1820 cm−1 (strong peak) , but does not have peaks at 3200-3650 or 1000-1250 cm−1?

Correct AnswerverifiedShow Answer

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) , but does not have peaks at 1630-1820 (strong) or 1600-1640 cm−1 (medium) ?

Correct AnswerverifiedShow Answer

The given molecule shows a stretching absorption peak at 2200-2250 cm−1 due to the presence of a _____. ​

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What range of wavelengths corresponds to the infrared region of the electromagnetic spectrum?

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Which of the following bonds gives rise to a medium strength absorbance at approximately 1600-1680 cm−¹ in the infrared spectrum?

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Which of the following compounds does not give an infrared spectrum with peak at ∼1750 cm−¹?

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Which of the following compounds gives an infrared spectrum with a peak at ∼1750 cm−¹, but no significant peaks at 3000-3500 cm−¹ or 1050-1250 cm−¹?

Correct Answer
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Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) and 1600-1640 cm−¹ (medium) ; but does not have peaks at 1630-1820 (strong) ?

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KBr and NaCl are used for samp...
View Answer

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Correct Answer
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Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 3200-3650 cm−¹ (strong) , but does not have peaks at 1630-1820 or 1000-1250 cm−¹

Correct Answer
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Which of the following compounds gives an infrared spectrum with a peak in the range of 1630-1820 cm−¹ (strong peak) , but does not have peaks at 3200-3650 or 1000-1250 cm−¹?

Correct Answer
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Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) , but does not have peaks at 1630-1820 (strong) or 1600-1640 cm−¹ (medium) ?

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The given molecule shows a stretching absorption peak at 2200-2250 cm⁻¹ due to the presence of a _____.

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Correct Answer
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