Question 1

Which of the following are units for wavenumber in IR spectroscopy?

Accepted Answer

A)  cm-1 
B)  cm 
C)  J.s-1 
D)  mm 
E)  none of these 
A)  cm-1 
B)  cm 
C)  J.s-1 
D)  mm 
E)  none of these

Question 2

Compounds containing chlorine or bromine usually show a strong _____peak.

Accepted Answer

A)  molecular ion 
B)  base 
C)  M+1 
D)  M+2 
E)  all of these 
A)  molecular ion 
B)  base 
C)  M+1 
D)  M+2 
E)  all of these

Question 3

Calculate the degree of unsaturation for C9H11N.

Accepted Answer

A)  4 
B)  6 
C)  2 
D)  5 
E)  none of these 
A)  4 
B)  6 
C)  2 
D)  5 
E)  none of these

Question 4

For each of the following IR spectra determine if it is consistent with the structure of an alcohol, a ketone, an aldehyde, a carboxylic acid, a primary amine or a secondary amine.
I.   SDBS: National Institute of Advanced Industrial Science and Technology
II.   SDBS: National Institute of Advanced Industrial Science and Technology

Accepted Answer

I: aldehyd

Question 5

Which of the following compounds will have odd m/z value for the molecular ion?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these

Question 6

Predict the product for the following reaction and explain how you will use IR spectroscopy to monitor the progress of the reaction.

Accepted Answer

@#IMG-DLM& A new absorption fo

Question 7

Provide a molecular formula that is consistent with the following mass spectrum data.
M+ .  at m/z= 73, relative height=86.1%
(M+1)+ .  at m/z= 74, relative height=3.2%

Accepted Answer

C<sub>3</s

Question 8

Which one of the following compounds will have the highest wavenumber for C=C absorption?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 9

Which of the following compounds will show an absorption at 2250 cm-1?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these

Question 10

Provide the structures of the fragments that result when the molecular ion of 2-heptanone undergoes fragmentation via McLafferty rearrangement.

Accepted Answer

The answer of Provide the structures of the fragments that...

Question 11

Which one of the following compounds is consistent with the following IR spectrum?   SDBS: National Institute of Advanced Industrial Science and Technology

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 12

Which one of the following compounds will have the lowest wavenumber for carbonyl absorption?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 13

Which molecular formula is consistent with the following mass spectrum data? M+ .  at m/z= 84, relative height=10.0%
(M+1)+ .  at m/z= 85, relative height=0.56%

Accepted Answer

A)  C5H10O 
B)  C5H8O 
C)  C5H24 
D)  C6H12 
E)  C4H6O2 
A)  C5H10O 
B)  C5H8O 
C)  C5H24 
D)  C6H12 
E)  C4H6O2

Question 14

Which of the following compounds will produce a prominent (M-18) peak in the mass spectrum?

Accepted Answer

A)  2-methylheptane 
B)  1-heptanol 
C)  heptanamine 
D)  heptanal 
E)  none of these 
A)  2-methylheptane 
B)  1-heptanol 
C)  heptanamine 
D)  heptanal 
E)  none of these

Question 15

In mass spectrometry, the tallest peak is assigned an intensity of 100% and is referred to as the ______________.

Accepted Answer

The answer of In mass spectrometry, the tallest peak is...

Question 16

Which of the following is expected to be the base peak in the mass spectrum of CH3CH2NH2?

Accepted Answer

A)  15 
B)  28 
C)  30 
D)  45 
E)  none of these 
A)  15 
B)  28 
C)  30 
D)  45 
E)  none of these

Question 17

How will you distinguish between the following compounds using high-resolution mass spectrometry?

Accepted Answer

Compound I: m/z at 1

Question 18

Which one of the following compounds is consistent with the mass spectrum below?   SDBS: National Institute of Advanced Industrial Science and Technology

Accepted Answer

A)  CH3CH2CH(CH3)2 
B)  CH3CHOHCH2CH3 
C)  CH3CH2OCH2CH3 
D)  CH3CH2NHCH2CH3 
E)  none of these 
A)  CH3CH2CH(CH3)2 
B)  CH3CHOHCH2CH3 
C)  CH3CH2OCH2CH3 
D)  CH3CH2NHCH2CH3 
E)  none of these

Question 19

Which of the m/z values corresponds to the base peak in the following mass spectrum?

Accepted Answer

A)  45 
B)  44 
C)  29 
D)  15 
E)  none of these 
A)  45 
B)  44 
C)  29 
D)  15 
E)  none of these

Question 20

Propose all possible structures for a compound with molecular formula C4H9N that shows two medium absorptions at 3400 cm-1 and no absorption in the range of 1600-1800 cm-1 in its IR spectrum.

Accepted Answer

Exam 15: Infrared Spectroscopy and Mass Spectrometry

Which of the following are units for wavenumber in IR spectroscopy?

Compounds containing chlorine or bromine usually show a strong _____peak.

Calculate the degree of unsaturation for C9H11N.

Which of the following compounds will have odd m/z value for the molecular ion?

Predict the product for the following reaction and explain how you will use IR spectroscopy to monitor the progress of the reaction.

Provide a molecular formula that is consistent with the following mass spectrum data. M+ . at m/z= 73, relative height=86.1% (M+1)+ . at m/z= 74, relative height=3.2%

Which one of the following compounds will have the highest wavenumber for C=C absorption?

Which of the following compounds will show an absorption at 2250 cm-1?

Provide the structures of the fragments that result when the molecular ion of 2-heptanone undergoes fragmentation via McLafferty rearrangement.

Which one of the following compounds is consistent with the following IR spectrum? SDBS: National Institute of Advanced Industrial Science and Technology

Which one of the following compounds will have the lowest wavenumber for carbonyl absorption?

Which molecular formula is consistent with the following mass spectrum data? M+ . at m/z= 84, relative height=10.0% (M+1)+ . at m/z= 85, relative height=0.56%

Which of the following compounds will produce a prominent (M-18) peak in the mass spectrum?

In mass spectrometry, the tallest peak is assigned an intensity of 100% and is referred to as the ______________.

Which of the following is expected to be the base peak in the mass spectrum of CH3CH2NH2?

How will you distinguish between the following compounds using high-resolution mass spectrometry?

Which one of the following compounds is consistent with the mass spectrum below? SDBS: National Institute of Advanced Industrial Science and Technology

Which of the m/z values corresponds to the base peak in the following mass spectrum?

Propose all possible structures for a compound with molecular formula C4H9N that shows two medium absorptions at 3400 cm-1 and no absorption in the range of 1600-1800 cm-1 in its IR spectrum.

A Review of General Chemistry: Electrons, Bonds, and Molecular Properties

Molecular Representations

Acids and Bases

Alkanes and Cycloalkanes

Stereoisomerism

Chemical Reactivity and Mechanisms

Substitution Reactions

Alkenes: Structure and Preparation Via Elimination Reactions

Addition Reactions of Alkenes

Alkynes

Radical Reactions

Synthesis

Alcohols and Phenols

Ethers and Epoxides; Thiols and Sulfides

Nuclear Magnetic Resonance Spectroscopy

Conjugated Pi Systems and Pericyclic Reactions

Aromatic Compounds

Aromatic Substitution Reactions

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Alpha Carbon Chemistry: Enols and Enolates

Amines

Carbohydrates

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

Filters

Calculate the degree of unsaturation for C₉H₁₁N.

Provide a molecular formula that is consistent with the following mass spectrum data. M⁺ ^. at m/z= 73, relative height=86.1% (M+1)⁺ ^. at m/z= 74, relative height=3.2%

Which of the following compounds will show an absorption at 2250 cm^-1?

Which molecular formula is consistent with the following mass spectrum data? M⁺ ^. at m/z= 84, relative height=10.0% (M+1)⁺ ^. at m/z= 85, relative height=0.56%

Which of the following is expected to be the base peak in the mass spectrum of CH₃CH₂NH₂?

Propose all possible structures for a compound with molecular formula C₄H₉N that shows two medium absorptions at 3400 cm^-1 and no absorption in the range of 1600-1800 cm^-1 in its IR spectrum.