Exam 10: Structure Determination: Mass Spectrometry, Infrared Spectroscopy, and Ultraviolet Spectroscopy

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Which type of spectroscopy (IR, UV, or MS) will best distinguish between the pair of compounds below? Give a brief reason.

(Essay)

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Question 21

What region of the IR spectrum would be the most useful in distinguishing between the following two compounds?

(Multiple Choice)

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Question 22

Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. -C−C, C−O, C−N, and C−X single-bond vibrations.

(Multiple Choice)

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Question 23

Which of the following compounds gives an infrared spectrum with a peak at ˜1750 cm−¹, but no significant peaks at 3000−3500 cm−¹ or 1050−1250 cm−¹?

(Multiple Choice)

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Question 24

Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s). (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/) -Refer to instructions. What peak represents the base peak?

(Short Answer)

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Question 25

Arrange the following in order of increasing energy. A. 3842 nm B. 2870 cm−¹ C. 2.91 × 10¹⁶ Hz D. 1.99 × 10−¹⁸ J

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Question 26

A 3.42 × 10−⁵ M solution of dibenzalacetone in ethanol produced an absorbance of 0.753 in a 1.00 cm cell. Based on this data, what is ε for this compound?

(Multiple Choice)

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Question 27

Which of the following regions in the electromagnetic spectrum corresponds to the radiation with the highest energy?

(Multiple Choice)

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Question 28

The amount of energy in electromagnetic radiation is related to the frequency and wavelength of the radiation. High energy radiation, like gamma rays, is of:

(Multiple Choice)

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Question 29

The amount of energy in infrared light corresponds to:

(Multiple Choice)

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Question 30

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

(Multiple Choice)

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Question 31

Which of the following bonds gives rise to a strong absorbance near 1700 cm−¹ in the infrared spectrum?

(Multiple Choice)

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Question 32

What are the masses of the charged fragments produced by alpha cleavage of the following?

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Question 33

Circle any of the following compounds that would be a candidate to produce a UV absorption spectrum.

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Question 34

Which of the following does not involve the interaction of molecules with electromagnetic energy?

(Multiple Choice)

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Question 35

Which of the following statements best describes the base peak in a mass spectrum?

(Multiple Choice)

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Question 36

Loratidine is the active ingredient in the antihistamine Claritin. Mass spectral analysis of loratidine shows M⁺ at m/z = 382. Loratidine is known to contain nitrogen. What is the minimum number of nitrogens in loratidine?

(Essay)

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Question 37

What is the vertical axis of a mass spectrum?

(Multiple Choice)

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Question 38

The source of absorbance of light at a wavelength of 6600 nm would be:

(Multiple Choice)

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Question 39

Which of the following peaks is not prominent in the mass spectrum of 2-methylbutan-2-ol?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 42

Exam 10: Structure Determination: Mass Spectrometry, Infrared Spectroscopy, and Ultraviolet Spectroscopy

Which type of spectroscopy (IR, UV, or MS) will best distinguish between the pair of compounds below? Give a brief reason.

What region of the IR spectrum would be the most useful in distinguishing between the following two compounds?

Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. -C−C, C−O, C−N, and C−X single-bond vibrations.

Which of the following compounds gives an infrared spectrum with a peak at ˜1750 cm−1, but no significant peaks at 3000−3500 cm−1 or 1050−1250 cm−1?

Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s). (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/) -Refer to instructions. What peak represents the base peak?

Arrange the following in order of increasing energy. A. 3842 nm B. 2870 cm−1 C. 2.91 × 1016 Hz D. 1.99 × 10−18 J

A 3.42 × 10−5 M solution of dibenzalacetone in ethanol produced an absorbance of 0.753 in a 1.00 cm cell. Based on this data, what is ε for this compound?

Which of the following regions in the electromagnetic spectrum corresponds to the radiation with the highest energy?

The amount of energy in electromagnetic radiation is related to the frequency and wavelength of the radiation. High energy radiation, like gamma rays, is of:

The amount of energy in infrared light corresponds to:

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

Which of the following bonds gives rise to a strong absorbance near 1700 cm−1 in the infrared spectrum?

What are the masses of the charged fragments produced by alpha cleavage of the following?

Circle any of the following compounds that would be a candidate to produce a UV absorption spectrum.

Which of the following does not involve the interaction of molecules with electromagnetic energy?

Which of the following statements best describes the base peak in a mass spectrum?

Loratidine is the active ingredient in the antihistamine Claritin. Mass spectral analysis of loratidine shows M+ at m/z = 382. Loratidine is known to contain nitrogen. What is the minimum number of nitrogens in loratidine?

What is the vertical axis of a mass spectrum?

The source of absorbance of light at a wavelength of 6600 nm would be:

Which of the following peaks is not prominent in the mass spectrum of 2-methylbutan-2-ol?

Structure and Bonding

Polar Covalent Bonds; Acids and Bases

Organic Compounds: Alkanes and Their Stereochemistry

Organic Compounds: Cycloalkanes and Their Stereochemistry

Stereochemistry at Tetrahedral Centers

An Overview of Organic Reactions

Alkenes and Alkynes

Reactions of Alkenes and Alkynes

Aromatic Compounds

Structure Determination: Mass Spectrometry, Infrared Spectroscopy, and Ultraviolet Spectroscopy

Structure Determination: Nuclear Magnetic Resonance Spectroscopy

Organohalides: Nucleophilic Substitutions and Eliminations

Alcohols, Phenols, and Thiols; Ethers and Sulfides

Aldehydes and Ketones: Nucleophilic Addition Reactions

Carboxylic Acids and Nitriles

Carboxylic Acid Derivatives: Nucleophilic Acyl Substitution Reactions

Carbonyl Alpha-Substitution and Condensation Reactions

Amines and Heterocycles

Biomolecules: Amino Acids, Peptides, and Proteins

Amino Acid Metabolism

Biomolecules: Carbohydrates

Carbohydrate Metabolism

Biomolecules: Lipids and Their Metabolism

Biomolecules: Nucleic Acids and Their Metabolism

Orbitals and Organic Chemistry: Pericyclic Reactionse

Synthetic Polymerse

Filters

Which of the following compounds gives an infrared spectrum with a peak at ˜1750 cm−¹, but no significant peaks at 3000−3500 cm−¹ or 1050−1250 cm−¹?

Arrange the following in order of increasing energy. A. 3842 nm B. 2870 cm−¹ C. 2.91 × 10¹⁶ Hz D. 1.99 × 10−¹⁸ J

A 3.42 × 10−⁵ M solution of dibenzalacetone in ethanol produced an absorbance of 0.753 in a 1.00 cm cell. Based on this data, what is ε for this compound?

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

Which of the following bonds gives rise to a strong absorbance near 1700 cm−¹ in the infrared spectrum?

Loratidine is the active ingredient in the antihistamine Claritin. Mass spectral analysis of loratidine shows M⁺ at m/z = 382. Loratidine is known to contain nitrogen. What is the minimum number of nitrogens in loratidine?