Question 1

The amount of energy in electromagnetic radiation is related to the frequency and wavelength of the radiation. High energy radiation, like gamma rays, is of:

Accepted Answer

A)  low frequency and short wavelength 
B)  low frequency and long wavelength 
C)  high frequency and short wavelength 
D)  high frequency and long wavelength

Question 2

Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur.
-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−1

Question 3

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

Accepted Answer

A)  C=O 
B)  C−O 
C)  C=C 
D)  C−C

Question 4

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)  visible

Question 5

Examining the infrared spectrum of a compound allows us to:

Accepted Answer

A)  determine the types of functional groups present in the compound 
B)  determine the carbon-hydrogen framework of the compound 
C)  determine the molecular weight of the compound 
D)  determine the nature of the conjugated pi electron system in the compound

Question 6

Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s). (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/) -Refer to instructions. What peak represents M⁺?

Accepted Answer

The answer of Refer to the mass spectrum of 2-methylbutane...

Question 7

The source of absorbance of light at a wavelength of 6600 nm would be:

Accepted Answer

A)  π → π* electron transitions 
B)  bond stretching 
C)  in-plane bending 
D)  out-of-plane bending 
E)  b, c, d

Question 8

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?

Accepted Answer

A) 
 
B) 
 
C) 
 
D)

Question 9

A 3.42 × 10−5 M solution of dibenzalacetone in ethanol produced an absorbance of 0.753 in a 1.00 cm cell. Based on this data, what is ε for this compound?

Accepted Answer

A)  2.57 × 105 
B)  2.20 × 104 
C)  4.54 × 10−5 
D)  2.92 × 104

Question 10

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

Accepted Answer

A) 
 
B) 
 
C) 
 
D)

Question 11

Circle any of the following compounds that would be a candidate to produce a UV absorption spectrum.

Accepted Answer

The answer of Circle any of the following compounds that...

Question 12

The amount of energy in infrared light corresponds to:

Accepted Answer

A)  the amount of energy needed to promote one electron from a bonding to an antibonding molecular orbital 
B)  the amount of energy needed to fragment a molecule 
C)  the amount of energy needed to strip a molecule of one electron to generate a cation radical 
D)  the amount of energy needed to increase certain molecular motions, such as bond vibrations, in organic molecules

Question 13

Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur.
-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−1

Question 14

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

Accepted Answer

A) 
 
B) 
 
C) 
 
D)

Question 15

Assume you are carrying out the conversion of 1-bromobutane to butan-1-ol. How could you use IR spectroscopy to determine when the reaction is complete?

Accepted Answer

The answer of Assume you are carrying out the conversion...

Question 16

What are the masses of the charged fragments produced by alpha cleavage of the following?

Accepted Answer

The answer of What are the masses of the charged...

Question 17

Select the most reasonable formula for the compounds with the following mass spectral data.
-Refer to instructions. M+ at m/z = 101

Accepted Answer

A)  C5H6Br 
B)  C5H12N2 
C)  C6H15N 
D)  C9H12O

Question 18

Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur.
-C−C, C−O, C−N, and C−X single-bond 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−1

Question 19

Which of the following compounds gives an infrared spectrum with a peak at strong 1730 cm−1?

Accepted Answer

A) 
 
B) 
 
C) 
 
D)

Question 20

Which of the following bonds gives rise to a strong absorbance near 1700 cm−1 in the infrared spectrum?

Accepted Answer

A)  C=O 
B)  C−O 
C)  C=C 
D)  C−C

Exam 10: Structure Determination: Mass Spectrometry, Infrared Spectroscopy, and Ultraviolet Spectroscopy

The amount of energy in electromagnetic radiation is related to the frequency and wavelength of the radiation. High energy radiation, like gamma rays, is of:

Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. -triple bond stretching vibrations.

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

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

Examining the infrared spectrum of a compound allows us to:

Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s). (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/) -Refer to instructions. What peak represents M⁺?

The source of absorbance of light at a wavelength of 6600 nm would be:

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?

A 3.42 × 10−⁵ M solution of dibenzalacetone in ethanol produced an absorbance of 0.753 in a 1.00 cm cell. Based on this data, what is ε for this compound?

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

Circle any of the following compounds that would be a candidate to produce a UV absorption spectrum.

The amount of energy in infrared light corresponds to:

Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. -C=O, C=N, and C=C bond absorptions.

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

Assume you are carrying out the conversion of 1-bromobutane to butan-1-ol. How could you use IR spectroscopy to determine when the reaction is complete?

What are the masses of the charged fragments produced by alpha cleavage of the following?

Select the most reasonable formula for the compounds with the following mass spectral data. -Refer to instructions. M⁺ at m/z = 101

Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. -C−C, C−O, C−N, and C−X single-bond vibrations.

Which of the following compounds gives an infrared spectrum with a peak at strong 1730 cm−¹?

Which of the following bonds gives rise to a strong absorbance near 1700 cm−¹ in the infrared spectrum?

Exam 10: Structure Determination: Mass Spectrometry, Infrared Spectroscopy, and Ultraviolet Spectroscopy

The amount of energy in electromagnetic radiation is related to the frequency and wavelength of the radiation. High energy radiation, like gamma rays, is of:

Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. -triple bond stretching vibrations.

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

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

Examining the infrared spectrum of a compound allows us to:

Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s). (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/) -Refer to instructions. What peak represents M+?

The source of absorbance of light at a wavelength of 6600 nm would be:

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?

A 3.42 × 10−5 M solution of dibenzalacetone in ethanol produced an absorbance of 0.753 in a 1.00 cm cell. Based on this data, what is ε for this compound?

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

Circle any of the following compounds that would be a candidate to produce a UV absorption spectrum.

The amount of energy in infrared light corresponds to:

Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. -C=O, C=N, and C=C bond absorptions.

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

Assume you are carrying out the conversion of 1-bromobutane to butan-1-ol. How could you use IR spectroscopy to determine when the reaction is complete?

What are the masses of the charged fragments produced by alpha cleavage of the following?

Select the most reasonable formula for the compounds with the following mass spectral data. -Refer to instructions. M+ at m/z = 101

Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. -C−C, C−O, C−N, and C−X single-bond vibrations.

Which of the following compounds gives an infrared spectrum with a peak at strong 1730 cm−1?

Which of the following bonds gives rise to a strong absorbance near 1700 cm−1 in the infrared spectrum?

Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s). (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/) -Refer to instructions. What peak represents M⁺?

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?

A 3.42 × 10−⁵ M solution of dibenzalacetone in ethanol produced an absorbance of 0.753 in a 1.00 cm cell. Based on this data, what is ε for this compound?

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

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

Select the most reasonable formula for the compounds with the following mass spectral data. -Refer to instructions. M⁺ at m/z = 101

Which of the following compounds gives an infrared spectrum with a peak at strong 1730 cm−¹?

Which of the following bonds gives rise to a strong absorbance near 1700 cm−¹ in the infrared spectrum?