Question 1

Arrange the indicated bonds in decreasing (highest to lowest)order of wavenumber.

Accepted Answer

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

Question 2

Arrange the following electromagnetic radiation in decreasing (highest to lowest)order of frequency.

Accepted Answer

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

Question 3

Which of the following electromagnetic radiation has the highest energy?

Accepted Answer

A) UV 
B) X-ray 
C) IR 
D) microwave 
E) visible 
A) UV 
B) X-ray 
C) IR 
D) microwave 
E) visible B

Question 4

Calculate the degree of unsaturation for C5H5Br2NO.

Accepted Answer

A) 4 
B) 6 
C) 2 
D) 3 
E) 7 
A) 4 
B) 6 
C) 2 
D) 3 
E) 7

Question 5

Which of the following bonds is IR inactive?

Accepted Answer

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

Question 6

Rank the indicated bonds in decreasing (highest to lowest)order of wavenumber.

Accepted Answer

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

Question 7

Calculate the degree of unsaturation for C14H14N2O.

Accepted Answer

A) 4 
B) 6 
C) 8 
D) 10 
E) 9 
A) 4 
B) 6 
C) 8 
D) 10 
E) 9

Question 8

Provide a molecular formula that is consistent with the following mass spectrum data.M+ .  at m/z= 136,relative height=65.6%
(M+1)+ .  at m/z= 137,relative height=6.2%

Accepted Answer

C<sub>9</s

Question 9

Presence of bromine produces M+ .  and (M+2)+ . peaks of equal intensity on a mass spectrum because:

Accepted Answer

A) 81Br isotope has higher natural abundance than 79Br isotope 
B) 79Br and 81Br isotopes have almost equal natural abundance 
C) 79Br isotope has higher natural abundance than 81Br isotope 
D) none of these 
A) 81Br isotope has higher natural abundance than 79Br isotope 
B) 79Br and 81Br isotopes have almost equal natural abundance 
C) 79Br isotope has higher natural abundance than 81Br isotope 
D) none of these

Question 10

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 11

Which of the m/z values correspond to the molecular ion 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 12

Which of the following compounds will show a broad absorption around 3300 cm-1 and at 1650 cm-1?

Accepted Answer

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

Question 13

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

Accepted Answer

Compound I: m/z at 9

Question 14

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 15

Which of the following is true about the molecular weight and the M+ . -m/z value for the following compound?

Accepted Answer

A) odd molecular weight,m/z-115 
B) odd molecular weight,m/z-121 
C) even molecular weight,m/z-96 
D) even molecular weight,m/z-132 
E) none of these 
A) odd molecular weight,m/z-115 
B) odd molecular weight,m/z-121 
C) even molecular weight,m/z-96 
D) even molecular weight,m/z-132 
E) none of these

Question 16

Which of the following alkene groups will produce the strongest signal?

Accepted Answer

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

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 of the following compounds will have two absorptions at 1820 cm-1 and 1740cm-1?

Accepted Answer

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

Question 19

Which of the following bonds would produce the weakest absorption?

Accepted Answer

A) C=C 
B) O-H 
C) C=O 
D) sp3C-H 
E) A & D 
A) C=C 
B) O-H 
C) C=O 
D) sp3C-H 
E) A & D

Question 20

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

Exam 15: Infrared Spectroscopy and Mass Spectrometry

Arrange the indicated bonds in decreasing (highest to lowest)order of wavenumber.

Arrange the following electromagnetic radiation in decreasing (highest to lowest)order of frequency.

Which of the following electromagnetic radiation has the highest energy?

Calculate the degree of unsaturation for C5H5Br2NO.

Which of the following bonds is IR inactive?

Rank the indicated bonds in decreasing (highest to lowest)order of wavenumber.

Calculate the degree of unsaturation for C14H14N2O.

Provide a molecular formula that is consistent with the following mass spectrum data.M+ . at m/z= 136,relative height=65.6% (M+1)+ . at m/z= 137,relative height=6.2%

Presence of bromine produces M+ . and (M+2)+ . peaks of equal intensity on a mass spectrum because:

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

Which of the m/z values correspond to the molecular ion peak in the following mass spectrum?

Which of the following compounds will show a broad absorption around 3300 cm-1 and at 1650 cm-1?

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

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

Which of the following is true about the molecular weight and the M+ . -m/z value for the following compound?

Which of the following alkene groups will produce the strongest signal?

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

Which of the following compounds will have two absorptions at 1820 cm-1 and 1740cm-1?

Which of the following bonds would produce the weakest absorption?

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

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 C₅H₅Br₂NO.

Calculate the degree of unsaturation for C₁₄H₁₄N₂O.

Provide a molecular formula that is consistent with the following mass spectrum data.M⁺ ^. at m/z= 136,relative height=65.6% (M+1)⁺ ^. at m/z= 137,relative height=6.2%

Presence of bromine produces M⁺ ^. and (M+2)⁺ ^. peaks of equal intensity on a mass spectrum because:

Which of the following compounds will show a broad absorption around 3300 cm^-1 and at 1650 cm^-1?

Which of the following is true about the molecular weight and the M⁺ ^. -m/z value for the following compound?

Which of the following compounds will have two absorptions at 1820 cm^-1 and 1740cm^-1?