Question 1

Which of the following statement(s)is(are)true for an IR-active bond?

Accepted Answer

A) the bond must be symmetrical 
B) it must change bond length 
C) it must change bond angle 
D) it must change bond dipole 
E) all of these 
A) the bond must be symmetrical 
B) it must change bond length 
C) it must change bond angle 
D) it must change bond dipole 
E) all of these

Question 2

Which of the following compounds will produce a prominent (M-15)peak in the mass spectrum?

Accepted Answer

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

Question 3

Mass spectrometry is primarily used to determine:

Accepted Answer

A) molecular formula of a compound 
B) molecular weight of a compound 
C) conjugation in a compound 
D) A & B 
E) A & C 
A) molecular formula of a compound 
B) molecular weight of a compound 
C) conjugation in a compound 
D) A & B 
E) A & C

Question 4

Absorption of _______radiation results in vibrational excitation of the bonds in a compound.

Accepted Answer

A) UV 
B) Microwave 
C) IR 
D) Visible 
E) x-ray 
A) UV 
B) Microwave 
C) IR 
D) Visible 
E) x-ray

Question 5

Propose a possible structure for a compound with molecular formula C5H8O2 that shows absorption at 1720 cm-1 and no absorption in the range of 1500-1700 cm-1 or 2600-2800 cm-1 in its IR spectrum.

Accepted Answer

Question 6

Which of the following vibrations are observed in IR spectroscopy?

Accepted Answer

A) stetching 
B) rotational 
C) bending 
D) A & B 
E) A & C 
A) stetching 
B) rotational 
C) bending 
D) A & B 
E) A & C

Question 7

Which of the following is true about CH3CH3+ . ?

Accepted Answer

A) it is the parent ion of ethane 
B) it is a molecular ion of ethane with m/z =30 
C) it is a fragment of propane 
D) A & B 
E) none of these 
A) it is the parent ion of ethane 
B) it is a molecular ion of ethane with m/z =30 
C) it is a fragment of propane 
D) A & B 
E) none of these

Question 8

Which of the following is not a prominent peak in the mass spectrum of 2-methyl-2-pentanol?

Accepted Answer

A) (M-15) 
B) (M-18) 
C) (M-29) 
D) (M-16) 
E) none of these 
A) (M-15) 
B) (M-18) 
C) (M-29) 
D) (M-16) 
E) none of these

Which of the following statement(s)is(are)true for an IR-active bond?

Which of the following compounds will produce a prominent (M-15)peak in the mass spectrum?

Mass spectrometry is primarily used to determine:

Absorption of _______radiation results in vibrational excitation of the bonds in a compound.

Propose a possible structure for a compound with molecular formula C₅H₈O₂ that shows absorption at 1720 cm^-1 and no absorption in the range of 1500-1700 cm^-1 or 2600-2800 cm^-1 in its IR spectrum.

Which of the following vibrations are observed in IR spectroscopy?

Which of the following is true about CH₃CH₃⁺ ^. ?

Which of the following is not a prominent peak in the mass spectrum of 2-methyl-2-pentanol?

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

Exam 15: Infrared Spectroscopy and Mass Spectrometry

Which of the following statement(s)is(are)true for an IR-active bond?

Which of the following compounds will produce a prominent (M-15)peak in the mass spectrum?

Mass spectrometry is primarily used to determine:

Absorption of _______radiation results in vibrational excitation of the bonds in a compound.

Propose a possible structure for a compound with molecular formula C5H8O2 that shows absorption at 1720 cm-1 and no absorption in the range of 1500-1700 cm-1 or 2600-2800 cm-1 in its IR spectrum.

Which of the following vibrations are observed in IR spectroscopy?

Which of the following is true about CH3CH3+ . ?

Which of the following is not a prominent peak in the mass spectrum of 2-methyl-2-pentanol?

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

Propose a possible structure for a compound with molecular formula C₅H₈O₂ that shows absorption at 1720 cm^-1 and no absorption in the range of 1500-1700 cm^-1 or 2600-2800 cm^-1 in its IR spectrum.

Which of the following is true about CH₃CH₃⁺ ^. ?