Exam 12: Infrared Spectroscopy

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. -_______ CH₃CH₂OCH(CH₃)

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Question 1

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

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Question 2

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Provide the structure of three compounds with the molecular formula C₄H₈O that give an absorption peak at 1600-1640 cm^-1 in the infrared spectrum, but no significant peaks at 3000-3600 cm^-1 or at 1650-1750 cm^-1.

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Question 3

Correct Answer:

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Any three of the following:

Which of the following regions in the electromagnetic spectrum corresponds to the radiation with the longest wavelength?

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Question 4

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

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Question 5

MATCH each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. Place the letter of the region in the blank to the left of the bond-type. -_____ C−C, C−O, C−N, and C−X single-bond vibrations.

(Multiple Choice)

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Question 6

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

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Question 7

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

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Question 8

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

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Question 9

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

(Multiple Choice)

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Question 10

Provide a brief explanation to account for the observation that the frequency of the C=O stretching absorption in the infrared spectrum of N,N-dimethylacetamide, CH₃CON(CH₃)₂, is higher than that of methyl acetate, CH₃CO₂CH₃.

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Question 11

Which of the following compounds gives a carbonyl bond absorption at the highest frequency?

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Question 12

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

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Question 13

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)?

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Question 14

In terms of the electromagnetic spectrum, 2870 cm−¹ represents lower energy than 2.91 × 10¹⁶ Hz.

(True/False)

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Question 15

Provide a brief explanation to account for the observation that the frequency of the C=O stretching absorption in the infrared spectrum of 2-butanone is higher than that of 3-buten-2-one.

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Question 16

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

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Question 17

The region of the IR spectrum between 1500 - 400 cm^-1 would be significantly different for the following two substances?

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Question 18

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 C₆H₁₄O)?

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Question 19

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. -_______ $\mathrm{H}_{3} \mathrm{C}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}$

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Question 20

Showing 1 - 20 of 74

Exam 12: Infrared Spectroscopy

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. -_______ CH3CH2OCH(CH3)

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

Provide the structure of three compounds with the molecular formula C4H8O that give an absorption peak at 1600-1640 cm-1 in the infrared spectrum, but no significant peaks at 3000-3600 cm-1 or at 1650-1750 cm-1.

Which of the following regions in the electromagnetic spectrum corresponds to the radiation with the longest wavelength?

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

MATCH each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. Place the letter of the region in the blank to the left of the bond-type. -_____ C−C, C−O, C−N, and C−X single-bond vibrations.

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

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

How could you distinguish between methyl butanoate and pentanoic acid 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 1630-1820 cm−1 (strong, broad), but does not have peaks at 3200-3650 or 1000-1250 cm−1

Provide a brief explanation to account for the observation that the frequency of the C=O stretching absorption in the infrared spectrum of N,N-dimethylacetamide, CH3CON(CH3)2, is higher than that of methyl acetate, CH3CO2CH3.

Which of the following compounds gives a carbonyl bond absorption at the highest frequency?

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

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)? ​

In terms of the electromagnetic spectrum, 2870 cm−1 represents lower energy than 2.91 × 1016 Hz.

Provide a brief explanation to account for the observation that the frequency of the C=O stretching absorption in the infrared spectrum of 2-butanone is higher than that of 3-buten-2-one.

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

The region of the IR spectrum between 1500 - 400 cm-1 would be significantly different for the following two substances?

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 C6H14O)? ​

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

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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. -_______ CH₃CH₂OCH(CH₃)

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

Provide the structure of three compounds with the molecular formula C₄H₈O that give an absorption peak at 1600-1640 cm^-1 in the infrared spectrum, but no significant peaks at 3000-3600 cm^-1 or at 1650-1750 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 functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 1630-1820 cm−¹ (strong, broad), but does not have peaks at 3200-3650 or 1000-1250 cm−¹

Provide a brief explanation to account for the observation that the frequency of the C=O stretching absorption in the infrared spectrum of N,N-dimethylacetamide, CH₃CON(CH₃)₂, is higher than that of methyl acetate, CH₃CO₂CH₃.

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)?

In terms of the electromagnetic spectrum, 2870 cm−¹ represents lower energy than 2.91 × 10¹⁶ Hz.

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

The region of the IR spectrum between 1500 - 400 cm^-1 would be significantly different for the following two substances?

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 C₆H₁₄O)?