Question 1

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/
-The peak at a m/z of _____ represents the base peak.

Accepted Answer

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

Question 2

Mass spectrometry and infrared spectroscopy are complementary techniques because mass spectrometry provides information about the molar mass and formula while infrared spectroscopy helps identify the functional groups in the formula.

Accepted Answer

Mass spectrometry gives detailed information about the molecular weight and structure of a molecule, allowing for the determination of its molecular formula. Infrared spectroscopy, on the other hand, identifies specific functional groups based on their characteristic absorption of infrared light, thus providing information about the molecule's chemical structure. Together, these techniques offer a comprehensive view of a molecule's composition and structure.

Question 3

Dehydration of the following compound will produce a peak at a m/z of _______.

Accepted Answer

The answer of Dehydration of the following compound will produce...

Question 4

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/ -The peak at a m/z of _____ represents the following species. +CH₂CH₃

Accepted Answer

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

Question 5

Cyclohexene and hex-2-yne both have the molecular formula, C₆H₁₀. The mass spectrum below belongs to ___________________.

Accepted Answer

The answer of Cyclohexene and hex-2-yne both have the molecular...

Question 6

Alpha cleavage of the following compound will produce a peak at a m/z of _______.

Accepted Answer

The answer of Alpha cleavage of the following compound will...

Question 7

What is the most likely molecular formula of a compound (that contains only C, H and O) which has a molecular ion in the EI mass spectrum with m/z of 104 and an M+1 peak that is 5.5% of the intensity of the molecular ion peak?

Accepted Answer

The answer of What is the most likely molecular formula...

Question 8

Consider the following mass spectrum C₅H₁₂O might have been used to produce this spectrum.

Accepted Answer

The answer of Consider the following mass spectrum C₅H₁₂O...

Question 9

What is the most likely molecular formula of a compound that has a molecular ion in the EI mass spectrum with m/z of 136, with a M+1 and M+2 peaks that are 4.4% and 49% of the intensity of the molecular ion peak, respectively.

Accepted Answer

The answer of What is the most likely molecular formula...

Question 10

What is the most likely molecular formula of a compound that has a molecular ion in the EI mass spectrum with m/z of 120, with a M+1 and M+2 peaks that are 6.6% and 24% of the intensity of the molecular ion peak, respectively.

Accepted Answer

The answer of What is the most likely molecular formula...

Question 11

A monochloroalkane shows two parent ion peaks m/z at 92 and 94. The molecular formula of this compound might be C₃H₇Cl.

Accepted Answer

The answer of A monochloroalkane shows two parent ion peaks...

Question 12

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/ -The peak at a m/z of _____ represents M⁺.

Accepted Answer

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

Question 13

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/
-The peak at a m/z of _____ represents the following species. $\mathrm{CH}_{3} \stackrel{+}{\mathrm{C}} \mathrm{HCH}_{2} \mathrm{CH}_{3}$

Accepted Answer

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

Question 14

The following question(s) refer to the mass spectrum shown below.  Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/
-The base peak in this spectrum occurs at a m/z of ______.

Accepted Answer

The answer of The following question(s) refer to the mass...

Question 15

The mass of the larger charged fragment produced by the dehydration of the following compound occurs at a m/z of _______. $\quad$$\mathrm{CH}_{3} \quad\mathrm{CH}_{3}$
$\quad$$\quad$|$\quad$$\quad$ |
$\mathrm{CH}_{3} \mathrm{CCH}_{2} \mathrm{CHCH}_{2} \mathrm{CH}_{2} \mathrm{OH}$
$\quad$$\quad$|
$\quad$$\mathrm{CH}_{3}$

Accepted Answer

The answer of The mass of the larger charged fragment...

Question 16

The mass spectrum of 1-pentanol shows an intense daughter ion peak at m/z = 31. This peak could be due to the formation of CH₃O⁺.

Accepted Answer

The daughter ion peak at m/z = 31 corresponds to the formation of CH₃O⁺, which is a common fragment ion in the mass spectra of alcohols.

Question 17

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/
-The peak at a m/z of _____ represents the following species. $\mathrm{CH}_{3} \stackrel{+}{\mathrm{C}} \mathrm{HCH}_{3}$

Accepted Answer

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

Question 18

What is the most likely molecular formula of a compound that has a molecular ion in the EI mass spectrum with m/z of 97 and an M+1 peak that is 6.6% of the intensity of the molecular ion peak?

Accepted Answer

The answer of What is the most likely molecular formula...

Question 19

Provide the mass of the three most prominent fragment peaks that are observed in the EI mass spectrum of 2-hexanone, CH₃CH₂CH₂CH₂COCH₃ (molecular ion m/z = 100) and describe the processes that lead to each of these fragments.

Accepted Answer

The answer of Provide the mass of the three most...

Question 20

This compound contains C, H, and one other atom. The other atom from the mass spectrum is __________.

Accepted Answer

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Quiz 14: Mass Spectrometry

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/ -The peak at a m/z of _____ represents the base peak.

Mass spectrometry and infrared spectroscopy are complementary techniques because mass spectrometry provides information about the molar mass and formula while infrared spectroscopy helps identify the functional groups in the formula.

Dehydration of the following compound will produce a peak at a m/z of _______.

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/ -The peak at a m/z of _____ represents the following species. +CH2CH3

Cyclohexene and hex-2-yne both have the molecular formula, C6H10. The mass spectrum below belongs to ___________________.

Alpha cleavage of the following compound will produce a peak at a m/z of _______.

What is the most likely molecular formula of a compound (that contains only C, H and O) which has a molecular ion in the EI mass spectrum with m/z of 104 and an M+1 peak that is 5.5% of the intensity of the molecular ion peak?

Consider the following mass spectrum C5H12O might have been used to produce this spectrum.

What is the most likely molecular formula of a compound that has a molecular ion in the EI mass spectrum with m/z of 136, with a M+1 and M+2 peaks that are 4.4% and 49% of the intensity of the molecular ion peak, respectively.

What is the most likely molecular formula of a compound that has a molecular ion in the EI mass spectrum with m/z of 120, with a M+1 and M+2 peaks that are 6.6% and 24% of the intensity of the molecular ion peak, respectively.

A monochloroalkane shows two parent ion peaks m/z at 92 and 94. The molecular formula of this compound might be C3H7Cl.

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/ -The peak at a m/z of _____ represents M+.

The following question(s) refer to the mass spectrum shown below. Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/ -The base peak in this spectrum occurs at a m/z of ______.

The mass spectrum of 1-pentanol shows an intense daughter ion peak at m/z = 31. This peak could be due to the formation of CH3O+.

What is the most likely molecular formula of a compound that has a molecular ion in the EI mass spectrum with m/z of 97 and an M+1 peak that is 6.6% of the intensity of the molecular ion peak?

Provide the mass of the three most prominent fragment peaks that are observed in the EI mass spectrum of 2-hexanone, CH3CH2CH2CH2COCH3 (molecular ion m/z = 100) and describe the processes that lead to each of these fragments.

This compound contains C, H, and one other atom. The other atom from the mass spectrum is __________.

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/ -The peak at a m/z of _____ represents the following species. +CH₂CH₃

Cyclohexene and hex-2-yne both have the molecular formula, C₆H₁₀. The mass spectrum below belongs to ___________________.

Consider the following mass spectrum C₅H₁₂O might have been used to produce this spectrum.

A monochloroalkane shows two parent ion peaks m/z at 92 and 94. The molecular formula of this compound might be C₃H₇Cl.

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/ -The peak at a m/z of _____ represents M⁺.

The mass spectrum of 1-pentanol shows an intense daughter ion peak at m/z = 31. This peak could be due to the formation of CH₃O⁺.

Provide the mass of the three most prominent fragment peaks that are observed in the EI mass spectrum of 2-hexanone, CH₃CH₂CH₂CH₂COCH₃ (molecular ion m/z = 100) and describe the processes that lead to each of these fragments.