Question 1

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) None of the above

Question 2

Which of the following compounds gives an infrared spectrum with no significant peaks at ~3300 cm-1or 1600-1680 cm-1? -1or 1600-1680 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 D)
F) B) and C)

Question 3

Which of the following bonds (circled)  gives the weakest absorbance in the infrared spectrum?

Accepted Answer

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

Question 4

Which of the following bonds gives rise to a strong absorbance at approximately 1630-1820 cm-1 in the infrared spectrum?

Accepted Answer

A)  C=O
B)  C-O
C)  C=C
D)  C ≡\equiv≡ C E) A) and D)
F) B) and C)

Question 5

Cyclohexene and 2-hexyne both have the molecular formula C6H10. Any of the following regions of an IR spectrum could be used to distinguish these two compounds.
3020-3100 cm-1
2100-2260 cm-1
1650-1670 cm-1

Accepted Answer

A) True 
 B)False

Question 6

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) A) and C)
F) A) and B)

Question 7

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) All of the above

Question 8

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

Accepted Answer

A)  O-H
B)  C-H
C)  C=O
D)  C ≡\equiv≡ C E) None of the above
F) A) and D)

Question 9

How could you distinguish between 1-hexyne and 2-hexyne by infrared spectroscopy?

Accepted Answer

1-Hexyne, a terminal alkyne, h...

Question 10

Which of the following bonds (circled)  vibrates at the highest frequency?

Accepted Answer

A)  1
B)  2
C)  3
D)  4E) A) and B)
F) All of the above

Question 11

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) C) and D)
F) B) and C) B

Question 12

The area in the infrared spectrum between 1400 and 400 cm-1 is called the functional group region.

Accepted Answer

A) True 
 B)False  False

Question 13

Which of the following bonds gives rise to a strong, broad, absorbance at approximately 3200-3650 cm-1 in the infrared spectrum?

Accepted Answer

A)  C=O
B)  O-H
C)  C=C
D)  C-HE) B) and D)
F) B) and C)

Question 14

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

Question 15

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) A) and B)
F) A) and C)

Question 16

How could you distinguish between 1-butanol and diethyl ether by infrared spectroscopy?

Accepted Answer

The infrared spectrum of 1-but...

Question 17

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) A) and C)
F) C) and D)

Question 18

Label three peaks in the following spectrum with the bond that gives rise to them, and identify the functional group that is present in the compound (the compound has a formula of C4H9NO)?

Accepted Answer

N-H: ~3500 cm^-1
C-H: ~...

Question 19

Which of the following compounds gives an infrared spectrum with peaks at 3000-3500 cm-1 and ~1750 cm-1? -1 and ~1750 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) B) and C)

Question 20

How could you distinguish between methyl butanoate and pentanoic acid by infrared spectroscopy?

Accepted Answer

The infrared spectrum of penta...

Exam 12: Infrared Spectroscopy

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 compounds gives an infrared spectrum with no significant peaks at ~3300 cm-1or 1600-1680 cm-1?

Correct AnswerverifiedShow Answer

Which of the following bonds (circled) gives the weakest absorbance in the infrared spectrum?

Correct AnswerverifiedB

Which of the following bonds gives rise to a strong absorbance at approximately 1630-1820 cm-1 in the infrared spectrum?

Correct AnswerverifiedShow Answer

Cyclohexene and 2-hexyne both have the molecular formula C6H10. Any of the following regions of an IR spectrum could be used to distinguish these two compounds. 3020-3100 cm-1 2100-2260 cm-1 1650-1670 cm-1

Correct AnswerverifiedShow Answer

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. -_______

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

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

Correct AnswerverifiedShow Answer

How could you distinguish between 1-hexyne and 2-hexyne by infrared spectroscopy?

Correct Answerverified1-Hexyne, a terminal alkyne, h...View AnswerShow Answer

Which of the following bonds (circled) vibrates at the highest frequency?

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 AnswerverifiedB

The area in the infrared spectrum between 1400 and 400 cm-1 is called the functional group region.

Correct AnswerverifiedFalse

Which of the following bonds gives rise to a strong, broad, absorbance at approximately 3200-3650 cm-1 in the infrared spectrum?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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) ?

Correct AnswerverifiedShow Answer

How could you distinguish between 1-butanol and diethyl ether by infrared spectroscopy?

Correct AnswerverifiedThe infrared spectrum of 1-but...View AnswerShow 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

Label three peaks in the following spectrum with the bond that gives rise to them, and identify the functional group that is present in the compound (the compound has a formula of C4H9NO)?

Correct AnswerverifiedN-H: ~3500 cm-1C-H: ~...View AnswerShow Answer

Which of the following compounds gives an infrared spectrum with peaks at 3000-3500 cm-1 and ~1750 cm-1?

Correct AnswerverifiedShow Answer

How could you distinguish between methyl butanoate and pentanoic acid by infrared spectroscopy?

Correct AnswerverifiedThe infrared spectrum of penta...View AnswerShow Answer

Correct Answer
verified

Which of the following compounds gives an infrared spectrum with no significant peaks at ~3300 cm^-¹or 1600-1680 cm^-¹?

Correct Answer
verified

Correct Answer
verified
B

Which of the following bonds gives rise to a strong absorbance at approximately 1630-1820 cm^-¹ in the infrared spectrum?

Correct Answer
verified

Cyclohexene and 2-hexyne both have the molecular formula C₆H₁₀. Any of the following regions of an IR spectrum could be used to distinguish these two compounds. 3020-3100 cm^-¹ 2100-2260 cm^-¹ 1650-1670 cm^-¹

Correct Answer
verified

Correct Answer
verified

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 Answer
verified

Correct Answer
verified

Correct Answer
verified
1-Hexyne, a terminal alkyne, h...
View Answer

Correct Answer
verified

Correct Answer
verified
B

The area in the infrared spectrum between 1400 and 400 cm^-1 is called the functional group region.

Correct Answer
verified
False

Which of the following bonds gives rise to a strong, broad, absorbance at approximately 3200-3650 cm^-¹ in the infrared spectrum?

Correct Answer
verified

Correct Answer
verified

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) ?

Correct Answer
verified

Correct Answer
verified
The infrared spectrum of 1-but...
View 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 Answer
verified

Label three peaks in the following spectrum with the bond that gives rise to them, and identify the functional group that is present in the compound (the compound has a formula of C₄H₉NO)?

Correct Answer
verified
N-H: ~3500 cm^-1
C-H: ~...
View Answer

Which of the following compounds gives an infrared spectrum with peaks at 3000-3500 cm^-¹ and ~1750 cm^-¹?

Correct Answer
verified

Correct Answer
verified
The infrared spectrum of penta...
View Answer