Question 1

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 2

What is the horizontal axis of a mass spectrum?

Accepted Answer

The horizontal axis of a mass spectrum is typically mass/charge (m/z) because it allows for different ions to have their mass measured while accounting for their charge. This means that ions of different sizes and charges can be compared on the same plot, which is useful for identifying and characterizing compounds.

Question 3

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

Accepted Answer

The C=O bond undergoes stretching at the highest frequency because it has a stronger bond than the other options and therefore requires more energy to stretch.

Question 4

What region of the IR spectrum would be the most useful in distinguishing between the following two compounds?

Accepted Answer

The answer of What region of the IR spectrum would...

Question 5

What are the units for electromagnetic radiation used in infrared spectroscopy?

Accepted Answer

Wavenumber, used in infrared spectroscopy, is measured in inverse centimeters (cm^-1), which is represented by the choice with the encoded text.

Question 6

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm^-1 (strong,broad peak)and 1640 cm^-1 (sharp,weak peak)?

Accepted Answer

The answer of Which of the following compounds gives an...

Question 7

Which of the following peaks is not prominent in the mass spectrum of 2-methylbutan-2-ol?

Accepted Answer

In mass spectrometry of organic compounds, the loss of 15, 18, and 29 mass units often corresponds to the loss of a methyl group (−CH3, 15 Da), water (−H2O, 18 Da), and an ethyl group (−C2H5, 29 Da), respectively. These are common fragmentation patterns for alcohols and other organic molecules. The loss of 21 mass units (option C) is not a common fragmentation pattern for alcohols like 2-methylbutan-2-ol, making it the correct choice.

Question 8

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 e for this compound?

Accepted Answer

Using Beer-Lambert Law, 
A = ecl
where A is absorbance, e is molar absorptivity, c is concentration and l is path length. 
Substituting the given values, 
0.753 = e x 3.42 ´ 10^-5 x 1.00 
e = 2.20 ´ 10^4 or 2.20 ´ 10^14 in scientific notation, which corresponds to option B.

Question 9

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

Accepted Answer

The answer of Which of the following compounds gives an...

Question 10

Which type of spectroscopy (IR,UV,or MS)will best distinguish between the pair of compounds below? Give a brief reason.

Accepted Answer

The answer of Which type of spectroscopy (IR,UV,or MS)will best...

Question 11

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

Accepted Answer

The answer of Which of the following bonds undergoes stretching...

Question 12

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

Accepted Answer

The C=O bond gives rise to a strong absorbance near 1700 cm-1 in the infrared spectrum.

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)?

Accepted Answer

The answer of Which of the following compounds gives an...

Question 14

Which of the following compounds would have the longest l_max in the UV region of the electromagnetic spectrum?

Accepted Answer

The answer of Which of the following compounds would have...

Question 15

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

Accepted Answer

The answer of Which of the following compounds gives an...

Question 16

What is the vertical axis of a mass spectrum?

Accepted Answer

The vertical axis of a mass spectrum represents the abundance or intensity of ions detected, typically reflecting the number of ions of a particular mass-to-charge ratio.

Question 17

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

The answer of Which of the following compounds gives an...

Question 18

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

Accepted Answer

According to the electromagnetic spectrum, radiation with the highest energy corresponds to shorter wavelengths and higher frequencies. Ultraviolet has shorter wavelengths and higher frequencies than radio waves, infrared, and visible light, making it the region with the highest energy.

Question 19

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

Accepted Answer

The answer of Which of the following compounds gives an...

Question 20

Match a structure from the list below to the following IR spectra.
-

Accepted Answer

The answer of Match a structure from the list below...

Quiz 10: Structure Determination: Mass Spectrometry,infrared Spectroscopy,and Ultraviolet Spectroscopy

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

What is the horizontal axis of a mass spectrum?

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

What region of the IR spectrum would be the most useful in distinguishing between the following two compounds?

What are the units for electromagnetic radiation used in infrared spectroscopy?

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm^-1 (strong,broad peak) and 1640 cm^-1 (sharp,weak peak) ?

Which of the following peaks is not prominent in the mass spectrum of 2-methylbutan-2-ol?

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 e for this compound?

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

Which type of spectroscopy (IR,UV,or MS)will best distinguish between the pair of compounds below? Give a brief reason.

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

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

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

Which of the following compounds would have the longest l_max in the UV region of the electromagnetic spectrum?

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

What is the vertical axis of a mass spectrum?

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?

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

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

Match a structure from the list below to the following IR spectra. -

Quiz 10: Structure Determination: Mass Spectrometry,infrared Spectroscopy,and Ultraviolet Spectroscopy

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

What is the horizontal axis of a mass spectrum?

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

What region of the IR spectrum would be the most useful in distinguishing between the following two compounds?

What are the units for electromagnetic radiation used in infrared spectroscopy?

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm-1 (strong,broad peak) and 1640 cm-1 (sharp,weak peak) ?

Which of the following peaks is not prominent in the mass spectrum of 2-methylbutan-2-ol?

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 e for this compound?

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

Which type of spectroscopy (IR,UV,or MS)will best distinguish between the pair of compounds below? Give a brief reason.

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

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

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

Which of the following compounds would have the longest lmax in the UV region of the electromagnetic spectrum?

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

What is the vertical axis of a mass spectrum?

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?

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

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

Match a structure from the list below to the following IR spectra. -

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm^-1 (strong,broad peak) and 1640 cm^-1 (sharp,weak peak) ?

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 e for this compound?

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?

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

Which of the following compounds would have the longest l_max in the UV region of the electromagnetic spectrum?

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

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?

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