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

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Instructions: Select the most reasonable formula for the compounds with the following mass spectral data. Refer to instructions.M⁺ at m/z = 101

(Multiple Choice)

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Question 21

Instructions: Select the most reasonable formula for the compounds with the following mass spectral data. Refer to instructions.M⁺ at m/z = 216

(Multiple Choice)

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Question 22

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

(Multiple Choice)

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Question 23

The amount of energy in infrared light corresponds to:

(Multiple Choice)

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Question 24

What are the masses of the charged fragments produced by the dehydration of the following compound?

(Essay)

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Question 25

At what approximate positions might the compound below show IR absorptions?

(Essay)

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Question 26

Instructions: 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?

(Essay)

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Question 27

Instructions: 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.Propose structures for fragment ions at m/z = 57,43,and 29.

(Essay)

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Question 28

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

(Multiple Choice)

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Question 29

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 e for this compound?

(Multiple Choice)

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Question 30

Consider the compound below: a)At what approximate positions might the compound show IR absorptions? b)How would this spectrum differ from that of cyclohexanol?

(Essay)

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Question 31

What is the horizontal axis of a mass spectrum?

(Multiple Choice)

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Question 32

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 33

Cyclohexene and hex-2-yne both have the molecular formula,C₆H₁₀. a)How would you use infrared spectroscopy to distinguish between the two compounds? b)How could the mass spectrum be used to distinguish between the two compounds?

(Essay)

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Question 34

Match a structure from the list below to the following IR spectra. -

(Essay)

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Question 35

What are the units for electromagnetic radiation used in infrared spectroscopy?

(Multiple Choice)

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Question 36

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

(Multiple Choice)

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Question 37

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

(Multiple Choice)

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Question 38

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

(Multiple Choice)

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Question 39

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 40

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

Instructions: Select the most reasonable formula for the compounds with the following mass spectral data. Refer to instructions.M+ at m/z = 101

Instructions: Select the most reasonable formula for the compounds with the following mass spectral data. Refer to instructions.M+ at m/z = 216

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

The amount of energy in infrared light corresponds to:

What are the masses of the charged fragments produced by the dehydration of the following compound?

At what approximate positions might the compound below show IR absorptions?

Instructions: 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?

Instructions: 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.Propose structures for fragment ions at m/z = 57,43,and 29.

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

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 e for this compound?

Consider the compound below: a)At what approximate positions might the compound show IR absorptions? b)How would this spectrum differ from that of cyclohexanol?

What is the horizontal axis of a mass spectrum?

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?

Cyclohexene and hex-2-yne both have the molecular formula,C6H10. a)How would you use infrared spectroscopy to distinguish between the two compounds? b)How could the mass spectrum be used to distinguish between the two compounds?

Match a structure from the list below to the following IR spectra. -

What are the units for electromagnetic radiation used in infrared spectroscopy?

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

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

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

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

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: 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

Filters

Instructions: Select the most reasonable formula for the compounds with the following mass spectral data. Refer to instructions.M⁺ at m/z = 101

Instructions: Select the most reasonable formula for the compounds with the following mass spectral data. Refer to instructions.M⁺ at m/z = 216

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 e for this compound?

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?

Cyclohexene and hex-2-yne both have the molecular formula,C₆H₁₀. a)How would you use infrared spectroscopy to distinguish between the two compounds? b)How could the mass spectrum be used to distinguish between the two compounds?

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