Question 1

An IR spectrum of an unknown organic molecule having the formula which contains carbon, hydrogen, and oxygen reveals a strong absorption at 1715-1725 cm-1. This molecule is most likely an ether.

Accepted Answer

A) True 
 B)False

Question 2

What is the frequency of a radiation with a wavelength of 3.0 × 10−5 m? (Speed of light = 3.0 × 108 m/s)

Accepted Answer

A)   1 × 1013 Hz
B)   2 × 1013 Hz
C)   1.1 × 1013 Hz
D)   1.2 × 1013 HzE) B) and C)
F) A) and C)

Question 3

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 C5H10O2)?
​

Accepted Answer

O-H: 3000-3600 cm^-1
C-...

Question 4

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 5

Which of the following compounds gives a carbonyl bond absorption at the lowest frequency?

Accepted Answer

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

Question 6

Which of the following bonds gives the weakest peak in the infrared spectrum for a stretching vibration?

Accepted Answer

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

Question 7

Which of the following compounds gives a carbonyl bond absorption at the highest frequency?

Accepted Answer

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

Question 8

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

Question 9

Which of the following regions in the electromagnetic spectrum corresponds to the radiation with the highest energy?

Accepted Answer

A)   radio waves
B)   ultraviolet
C)   infrared
D)   visibleE) A) and B)
F) A) and C)

Question 10

he amount of energy in infrared light corresponds to the amount of energy needed to increase certain molecular motions, such as bond vibrations, in organic molecules.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following bonds gives rise to an absorbance at approximately 2700-3300 cm−1 in the infrared spectrum?

Accepted Answer

A)   C≡C
B)   C=O
C)   C=C
D)   C−HE) A) and D)
F) C) and D)

Question 12

What is the energy of a photon moving with a frequency of 10.0 × 1010 s−1? (Planck's constant = 6.626 × 10−34 J s)

Accepted Answer

A)   6.626 × 10−23 J
B)   6.626 × 10−22 J
C)   66.26 × 10−23 J
D)   66.26 × 10−25 JE) A) and B)
F) All of the above

Question 13

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm−1 (sharp peak)  and 2150 cm−1 (sharp peak) ? 1 (sharp peak)  and 2150 cm−1 (sharp peak) ?   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 D)

Question 14

Which of the following relationships is not valid as applied to infrared spectroscopy?

Accepted Answer

A)   wavenumber = 1/λ (in cm) 
B)   ΔE = h ν
C)   ΔE = λ ν
D)   ν = 4.12 √(K/μ) E) None of the above
F) A) and B)

Exam 12: Infrared Spectroscopy

An IR spectrum of an unknown organic molecule having the formula which contains carbon, hydrogen, and oxygen reveals a strong absorption at 1715-1725 cm^-1. This molecule is most likely an ether.

Correct Answer
verified

Which of the following bonds gives the weakest peak in the infrared spectrum for a stretching vibration?

Correct Answer
verified

What is the energy of a photon moving with a frequency of 10.0 × 10¹⁰ s⁻¹? (Planck's constant = 6.626 × 10⁻³⁴ J s)

Correct Answer
verified

he amount of energy in infrared light corresponds to the amount of energy needed to increase certain molecular motions, such as bond vibrations, in organic molecules.

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 C₅H₁₀O₂)?

Correct Answer
verified
O-H: 3000-3600 cm^-1
C-...
View Answer

Which of the following relationships is not valid as applied to infrared spectroscopy?

Correct Answer
verified

Which of the following compounds gives a carbonyl bond absorption at the lowest frequency?

Correct Answer
verified

Which of the following compounds gives a carbonyl bond absorption at the highest frequency?

Correct Answer
verified

Which of the following regions in the electromagnetic spectrum corresponds to the radiation with the highest energy?

Correct Answer
verified

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm−¹ (sharp peak) and 2150 cm−¹ (sharp peak) ?

Correct Answer
verified

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

Correct Answer
verified

Which of the following bonds gives rise to an absorbance at approximately 2700-3300 cm−¹ in the infrared spectrum?

Correct Answer
verified

What is the frequency of a radiation with a wavelength of 3.0 × 10⁻⁵ m? (Speed of light = 3.0 × 10⁸ m/s)

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

Exam 12: Infrared Spectroscopy

An IR spectrum of an unknown organic molecule having the formula which contains carbon, hydrogen, and oxygen reveals a strong absorption at 1715-1725 cm-1. This molecule is most likely an ether.

Correct AnswerverifiedShow Answer

Which of the following bonds gives the weakest peak in the infrared spectrum for a stretching vibration?

Correct AnswerverifiedShow Answer

What is the energy of a photon moving with a frequency of 10.0 × 1010 s−1? (Planck's constant = 6.626 × 10−34 J s)

Correct AnswerverifiedShow Answer

he amount of energy in infrared light corresponds to the amount of energy needed to increase certain molecular motions, such as bond vibrations, in organic molecules.

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 C5H10O2)? ​

Correct AnswerverifiedO-H: 3000-3600 cm-1C-...View AnswerShow Answer

Which of the following relationships is not valid as applied to infrared spectroscopy?

Correct AnswerverifiedShow Answer

Which of the following compounds gives a carbonyl bond absorption at the lowest frequency?

Correct AnswerverifiedShow Answer

Which of the following compounds gives a carbonyl bond absorption at the highest frequency?

Correct AnswerverifiedShow Answer

Which of the following regions in the electromagnetic spectrum corresponds to the radiation with the highest energy?

Correct AnswerverifiedShow Answer

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm−1 (sharp peak) and 2150 cm−1 (sharp peak) ?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following bonds gives rise to an absorbance at approximately 2700-3300 cm−1 in the infrared spectrum?

Correct AnswerverifiedShow Answer

What is the frequency of a radiation with a wavelength of 3.0 × 10−5 m? (Speed of light = 3.0 × 108 m/s)

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

An IR spectrum of an unknown organic molecule having the formula which contains carbon, hydrogen, and oxygen reveals a strong absorption at 1715-1725 cm^-1. This molecule is most likely an ether.

Correct Answer
verified

Correct Answer
verified

What is the energy of a photon moving with a frequency of 10.0 × 10¹⁰ s⁻¹? (Planck's constant = 6.626 × 10⁻³⁴ J s)

Correct Answer
verified

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 C₅H₁₀O₂)?

Correct Answer
verified
O-H: 3000-3600 cm^-1
C-...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm−¹ (sharp peak) and 2150 cm−¹ (sharp peak) ?

Correct Answer
verified

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

Correct Answer
verified

Which of the following bonds gives rise to an absorbance at approximately 2700-3300 cm−¹ in the infrared spectrum?

Correct Answer
verified

What is the frequency of a radiation with a wavelength of 3.0 × 10⁻⁵ m? (Speed of light = 3.0 × 10⁸ m/s)

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