Question 1

Which of the following functional groups will exhibit no IR absorption at 1630 - 1780 cm-1 or at 3200 - 3550 cm-1?

Accepted Answer

A) an alcohol 
B) an amide 
C) a ketone 
D) an aldehyde 
E) an ether 
A) an alcohol 
B) an amide 
C) a ketone 
D) an aldehyde 
E) an ether

Question 2

An infrared wavelength of 4.48μm is equivalent to a wavenumber of ________ cm-1.

Accepted Answer

Question 3

Which of the following m/z values is least intense in the mass spectrum of 1-chloropropane?

Accepted Answer

A) 80 
B) 79 
C) 78 
D) 65 
E) 63 
A) 80 
B) 79 
C) 78 
D) 65 
E) 63

Question 4

Which has the higher speed in a vacuum,ultraviolet or infrared light?

Accepted Answer

They have

Question 5

While cleaning the organic stockroom,a student found a bottle of ethanol labeled "Denatured with Benzene." He decided to determine the concentration of benzene in the ethanol by acquiring the UV spectrum of the liquid in a 2.0 cm cell.The spectrum exhibited an absorption band at 260 nm which was attributable to benzene,and the absorbance of this band was 0.69.In a reference source,the student found that the molar absorptivity of this benzene band in ethanol was 230 M-1cm-1.Show how the student calculated the concentration of the benzene in the ethanol.

Accepted Answer

A = clε c = A/lε c =

Question 6

Which of the following is/are true about the MS of 1-bromobutane?

Accepted Answer

A) Peaks of approximately equal intensity are observed at m/z 136 and 138. 
B) The major fragmentation occurs by cleavage of the C-Br bond. 
C) The most intense peak occurs at m/z 43. 
D) both A and B 
E) both B and C 
A) Peaks of approximately equal intensity are observed at m/z 136 and 138. 
B) The major fragmentation occurs by cleavage of the C-Br bond. 
C) The most intense peak occurs at m/z 43. 
D) both A and B 
E) both B and C

Question 7

The C   C stretch in the following molecule shows at

Accepted Answer

A) 3300-2500 cm-1. 
B) 1680-1600 cm-1. 
C) 1780-1650 cm-1. 
D) 2260-2100 cm-1. 
E) none of the above. 
A) 3300-2500 cm-1. 
B) 1680-1600 cm-1. 
C) 1780-1650 cm-1. 
D) 2260-2100 cm-1. 
E) none of the above.

Question 8

Which of the following m/z values is the base peak for benzyl alcohol?

Accepted Answer

A) 77 
B) 108 
C) 91 
D) 17 
E) 52 
A) 77 
B) 108 
C) 91 
D) 17 
E) 52

Question 9

Which of the infrared regions is considered to be the fingerprint region?

Accepted Answer

A) 4000cm-1 - 1000cm-1 
B) 4000μm - 1000μm 
C) 2200μm - 1000μm 
D) 1000cm-1 - 400cm-1 
E) 1000μm - 400μm 
A) 4000cm-1 - 1000cm-1 
B) 4000μm - 1000μm 
C) 2200μm - 1000μm 
D) 1000cm-1 - 400cm-1 
E) 1000μm - 400μm

Question 10

McLafferty rearrangement involves a

Accepted Answer

A) 3-membered transition state. 
B) 4-membered transition state. 
C) 5-membered transition state. 
D) 6-membered transition state. 
E) 7-membered transition state. 
A) 3-membered transition state. 
B) 4-membered transition state. 
C) 5-membered transition state. 
D) 6-membered transition state. 
E) 7-membered transition state.

Question 11

Which compound's carbonyl stretch occurs at the greatest wavenumber?

Accepted Answer

A) CH3CH2CH2CHO 
B) CH3COCH2CH3 
C) CH3CH2CONH2 
D) CH3CH2CO2CH3 
E) CH3CH2COCH2CH3 
A) CH3CH2CH2CHO 
B) CH3COCH2CH3 
C) CH3CH2CONH2 
D) CH3CH2CO2CH3 
E) CH3CH2COCH2CH3

Question 12

Which compound would be expected to show intense IR absorption at 1715 cm-1?

Accepted Answer

A) CH3CH2CO2H 
B) 1-hexene 
C) 2-methylhexane 
D) CH3CH2CH2NH2 
A) CH3CH2CO2H 
B) 1-hexene 
C) 2-methylhexane 
D) CH3CH2CH2NH2

Question 13

Which of the following statements best explains the information we can gain from mass spectrometry?

Accepted Answer

A) It allows us to determine the number of protons in a compound. 
B) It allows us to determine the kinds of functional groups in a compound. 
C) It allows us to determine the molecular weight and the mass of some fragments of a compound. 
D) It allows us to determine the presence and nature of a carbocation in the compound. 
E) It allows us to determine the presence and nature of a free radical in the compound. 
A) It allows us to determine the number of protons in a compound. 
B) It allows us to determine the kinds of functional groups in a compound. 
C) It allows us to determine the molecular weight and the mass of some fragments of a compound. 
D) It allows us to determine the presence and nature of a carbocation in the compound. 
E) It allows us to determine the presence and nature of a free radical in the compound.

Question 14

Which of the following is the base peak for the compound below?

Accepted Answer

A) 77 
B) 92 
C) 15 
D) 57 
E) 43 
A) 77 
B) 92 
C) 15 
D) 57 
E) 43

Question 15

Which region of the electromagnetic spectrum,IR or UV,contains photons of the higher energy?

Accepted Answer

The answer of Which region of the electromagnetic spectrum,IR or...

Question 16

Which region of the electromagnetic spectrum,IR or X-ray,is characterized by waves of lower frequency?

Accepted Answer

The answer of Which region of the electromagnetic spectrum,IR or...

Question 17

What technique can be used to determine the molecular formula of a compound?

Accepted Answer

High resol

Question 18

Which of the following carbon-hydrogen bonds exhibits the lowest wavenumber for a C-H stretch in infrared spectroscopy?

Accepted Answer

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

Question 19

Give the fragment(s)that corresponds to a m/z charge of 58 for ethylpropylamine.You may choose more than one answer.

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 20

Which of the following structures will give a base peak of 43 in mass spectrometry?

Accepted Answer

A)    
B) CH3CH2CH2CH2CH2CH3 
C)    
D)    
E) none of the above 
A)    
B) CH3CH2CH2CH2CH2CH3 
C)    
D)    
E) none of the above

Exam 13: Mass Spectrometry,infrared Spectroscopy,and Uvvis Spectroscopy

Which of the following functional groups will exhibit no IR absorption at 1630 - 1780 cm-1 or at 3200 - 3550 cm-1?

An infrared wavelength of 4.48μm is equivalent to a wavenumber of ________ cm-1.

Which of the following m/z values is least intense in the mass spectrum of 1-chloropropane?

Which has the higher speed in a vacuum,ultraviolet or infrared light?

Which of the following is/are true about the MS of 1-bromobutane?

The C C stretch in the following molecule shows at

Which of the following m/z values is the base peak for benzyl alcohol?

Which of the infrared regions is considered to be the fingerprint region?

McLafferty rearrangement involves a

Which compound's carbonyl stretch occurs at the greatest wavenumber?

Which compound would be expected to show intense IR absorption at 1715 cm-1?

Which of the following statements best explains the information we can gain from mass spectrometry?

Which of the following is the base peak for the compound below?

Which region of the electromagnetic spectrum,IR or UV,contains photons of the higher energy?

Which region of the electromagnetic spectrum,IR or X-ray,is characterized by waves of lower frequency?

What technique can be used to determine the molecular formula of a compound?

Which of the following carbon-hydrogen bonds exhibits the lowest wavenumber for a C-H stretch in infrared spectroscopy?

Give the fragment(s)that corresponds to a m/z charge of 58 for ethylpropylamine.You may choose more than one answer.

Which of the following structures will give a base peak of 43 in mass spectrometry?

Remembering General Chemistry: Electronic Structure and Bonding

Acids and Bases: Central to Understanding Organic Chemistry

An Introduction to Organic Compounds: Nomenclature, physical Properties, and Structure

Isomers: the Arrangement of Atoms in Space

Alkenes: Structure,nomenclature,and an Introduction to Reactivity - Thermodynamics and Kinetics

The Reactions of Alkenes - the Stereochemistry of Addition Reactions

The Reactions of Alkynes - Introduction to Multistep Synthesis

Delocalized Electrons: Their Effect on Stability, pka, and the Products of a Reaction - Aromaticity and Electronic Effects: an Introduction to the Reactions of Benzene

Substitution and Elimination Reactions of Alkyl Halides

Reactions of Alcohols, ethers, epoxides, amines and Sulfur-Containing Compounds

Organometallic Compounds

Radicals

Nmr Spectroscopy

Reactions of Carboxylic Acids and Carboxylic Acid Derivatives

Reactions of Aldehydes and Ketones

Reactions at the Α-Carbon

Reactions of Benzene and Substituted Benzenes

More About Amines - Reactions of Heterocylic Compounds

The Organic Chemistry of Carbohydrates

Amino Acids,peptides,and Proteins

Catalysis in Organic Reactions and in Enzymatic Reactions

The Organic Chemistry of the Coenzymes, compounds Derived From Vitamins

The Organic Chemistry of the Metabolic Pathways

The Organic Chemistry of Lipids

The Chemistry of the Nucleic Acids

Synthetic Polymers

Pericyclic Reactions

Filters

Which of the following functional groups will exhibit no IR absorption at 1630 - 1780 cm^-1 or at 3200 - 3550 cm^-1?

An infrared wavelength of 4.48μm is equivalent to a wavenumber of ________ cm^-1.

Which compound would be expected to show intense IR absorption at 1715 cm^-1?