Question 1

The area in the infrared spectrum between 1400 and 400 cm-1 is called the functional group region.

Accepted Answer

A) True 
 B)False  False

Question 2

Which of the following bonds (circled) gives the weakest absorbance in the infrared spectrum?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4 B

Question 3

Which of the following laws relates the frequency of a stretching vibration to the masses and spring constant of a simple harmonic oscillator?

Accepted Answer

A) Pan's law 
B) Hooke's law 
C) Peter's law 
D) Barrie's law 
A) Pan's law 
B) Hooke's law 
C) Peter's law 
D) Barrie's law B

Question 4

MATCH each of the following molecules to the region of the infrared spectrum in which they may show a significant absorption. Place the letter of the region in the blank to the left of the bond-type.
-_______

Accepted Answer

A) 4000 to 2500 cm-1 
B) 2500 to 2000 cm-1 
C) 2000 to 1500 cm-1 
D) below 1500 cm-1 
A) 4000 to 2500 cm-1 
B) 2500 to 2000 cm-1 
C) 2000 to 1500 cm-1 
D) below 1500 cm-1

Question 5

Which of the following bonds undergoes stretching at the highest frequency?

Accepted Answer

A) O-H 
B) C-H 
C) C=O 
D) C$\equiv$C 
A) O-H 
B) C-H 
C) C=O 
D) C$\equiv$C

Question 6

Which of the following compounds gives an infrared spectrum with no significant peaks at ~3300 cm-1or 1600-1680 cm-1?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 7

Which of the following bonds gives rise to a strong absorbance at approximately 1630-1820 cm-1 in the infrared spectrum?

Accepted Answer

A) C=O 
B) C-O 
C) C=C 
D) C$\equiv$C 
A) C=O 
B) C-O 
C) C=C 
D) C$\equiv$C

Question 8

Which of the following compounds gives an infrared spectrum with peaks at 3000-3500 cm-1 and ~1750 cm-1?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 9

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad), but does not have peaks at 1630-1820 (strong) or 1600-1640 cm-1 (medium)?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 10

How could you distinguish between 1-butanol and diethyl ether by infrared spectroscopy?

Accepted Answer

The infrared spectrum of 1-but

Question 11

MATCH a structure from the list below to the following IR spectra. Place the letter of the structure in the blank provided.
-_____   Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/

Accepted Answer

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

Question 12

How could you distinguish between methyl butanoate and pentanoic acid by infrared spectroscopy?

Accepted Answer

The infrared spectrum of penta

Question 13

Which of the following bonds (circled) vibrates at the highest frequency?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 14

Label three peaks in the following spectrum with the bond that gives rise to them, and identify the functional group that is present in the compound (the compound has a formula of C4H9NO)?

Accepted Answer

N-H: ~3500 cm^-1 C-H: ~

Question 15

Which of the following bonds gives rise to a strong, broad, absorbance at approximately 3200-3650 cm-1 in the infrared spectrum?

Accepted Answer

A) C=O 
B) O-H 
C) C=C 
D) C-H 
A) C=O 
B) O-H 
C) C=C 
D) C-H

Question 16

How could you distinguish between 1-hexyne and 2-hexyne by infrared spectroscopy?

Accepted Answer

1-Hexyne, a terminal alkyne, h

Question 17

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 3200-3650 cm-1 (strong), but does not have peaks at 1630-1820 or 1000-1250 cm-1

Accepted Answer

A) alcohol 
B) aldehyde or ketone 
C) ether 
D) ester 
A) alcohol 
B) aldehyde or ketone 
C) ether 
D) ester

Question 18

Which of the following bonds undergoes stretching at the highest frequency?

Accepted Answer

A) C=O 
B) C-O 
C) C=C 
D) C-C 
A) C=O 
B) C-O 
C) C=C 
D) C-C

Question 19

Cyclohexene and 2-hexyne both have the molecular formula C6H10. Any of the following regions of an IR spectrum could be used to distinguish these two compounds.
3020-3100 cm-1
2100-2260 cm-1
1650-1670 cm-1

Accepted Answer

A) True 
 B)False

Question 20

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) and 1600-1640 cm-1 (medium); but does not have peaks at 1630-1820 (strong)?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Exam 12: Infrared Spectroscopy

The area in the infrared spectrum between 1400 and 400 cm-1 is called the functional group region.

Which of the following bonds (circled) gives the weakest absorbance in the infrared spectrum?

Which of the following laws relates the frequency of a stretching vibration to the masses and spring constant of a simple harmonic oscillator?

MATCH each of the following molecules to the region of the infrared spectrum in which they may show a significant absorption. Place the letter of the region in the blank to the left of the bond-type. -_______

Which of the following bonds undergoes stretching at the highest frequency?

Which of the following compounds gives an infrared spectrum with no significant peaks at ~3300 cm-1or 1600-1680 cm-1?

Which of the following bonds gives rise to a strong absorbance at approximately 1630-1820 cm-1 in the infrared spectrum?

Which of the following compounds gives an infrared spectrum with peaks at 3000-3500 cm-1 and ~1750 cm-1?

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad), but does not have peaks at 1630-1820 (strong) or 1600-1640 cm-1 (medium)?

How could you distinguish between 1-butanol and diethyl ether by infrared spectroscopy?

MATCH a structure from the list below to the following IR spectra. Place the letter of the structure in the blank provided. -_____ Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/

How could you distinguish between methyl butanoate and pentanoic acid by infrared spectroscopy?

Which of the following bonds (circled) vibrates at the highest frequency?

Label three peaks in the following spectrum with the bond that gives rise to them, and identify the functional group that is present in the compound (the compound has a formula of C4H9NO)?

Which of the following bonds gives rise to a strong, broad, absorbance at approximately 3200-3650 cm-1 in the infrared spectrum?

How could you distinguish between 1-hexyne and 2-hexyne by infrared spectroscopy?

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 3200-3650 cm-1 (strong), but does not have peaks at 1630-1820 or 1000-1250 cm-1

Which of the following bonds undergoes stretching at the highest frequency?

Cyclohexene and 2-hexyne both have the molecular formula C6H10. Any of the following regions of an IR spectrum could be used to distinguish these two compounds. 3020-3100 cm-1 2100-2260 cm-1 1650-1670 cm-1

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) and 1600-1640 cm-1 (medium); but does not have peaks at 1630-1820 (strong)?

Covalent Bonding and Shapes of Molecules

Alkanes and Cycloalkanes

Stereoisomerism and Chirality

Acids and Bases

Alkenes: Bonding, Nomenclature, and Properties

Reactions of Alkenes

Alkynes

Haloalkanes, Halogenation, and Radical Reactions

Nucleophilic Substitution and Beta-Elimination

Alcohols

Ethers, Epoxides, and Sulfides

Nuclear Magnetic Resonance Spectroscopy

Mass Spectrometry

An Introduction to Organometallic Compounds

Aldehydes and Ketones

Carboxylic Acids

Functional Derivatives of Carboxylic Acids

Enolate Anions and Enamines

Dienes, Conjugated Systems, and Pericyclic Reactions

Benzene and the Concept of Aromaticity

Reactions of Benzene and Its Derivatives

Amines

Catalytic Carbon-Carbon Bond Formation

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids

Organic Polymer Chemistry

Filters

The area in the infrared spectrum between 1400 and 400 cm^-1 is called the functional group region.

Which of the following compounds gives an infrared spectrum with no significant peaks at ~3300 cm^-¹or 1600-1680 cm^-¹?

Which of the following bonds gives rise to a strong absorbance at approximately 1630-1820 cm^-¹ in the infrared spectrum?

Which of the following compounds gives an infrared spectrum with peaks at 3000-3500 cm^-¹ and ~1750 cm^-¹?

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad), but does not have peaks at 1630-1820 (strong) or 1600-1640 cm^-¹ (medium)?

Label three peaks in the following spectrum with the bond that gives rise to them, and identify the functional group that is present in the compound (the compound has a formula of C₄H₉NO)?

Which of the following bonds gives rise to a strong, broad, absorbance at approximately 3200-3650 cm^-¹ in the infrared spectrum?

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 3200-3650 cm^-¹ (strong), but does not have peaks at 1630-1820 or 1000-1250 cm^-¹

Cyclohexene and 2-hexyne both have the molecular formula C₆H₁₀. Any of the following regions of an IR spectrum could be used to distinguish these two compounds. 3020-3100 cm^-¹ 2100-2260 cm^-¹ 1650-1670 cm^-¹

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) and 1600-1640 cm^-¹ (medium); but does not have peaks at 1630-1820 (strong)?