Filters
Question type
Study Flashcards

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


A) The peak from the most stable radical.
B) The peak from the species that has the isotope with the highest atomic number.
C) The peak of highest intensity.
D) The peak from the molecule minus an electron.
E) The M +1 peak

F) B) and E)
G) A) and C)

Correct Answer

verifed

verified

What is the horizontal axis of a mass spectrum?


A) mass
B) mass/energy
C) mass/charge
D) charge

E) C) and D)
F) B) and D)

Correct Answer

verifed

verified

Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s). 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. (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.

Correct Answer

verifed

verified

m/z
struct...

View Answer

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


A) O−H
B) C−H
C) C=O
D) C
C

E) B) and C)
F) A) and B)

Correct Answer

verifed

verified

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


A) cm
B) cm−1
C) J.mol−1
D) none, wavenumber is a dimensionless quantity

E) B) and D)
F) A) and B)

Correct Answer

verifed

verified

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?

Correct Answer

verifed

verified

Since the molecular ions are e...

View Answer

What region of the IR spectrum would be the most useful in distinguishing between the following two compounds? What region of the IR spectrum would be the most useful in distinguishing between the following two compounds? A) Above 2850 cm−<sup>1</sup> B) Between 2850 and 2000 cm−<sup>1</sup> C) Between 2000 and 1500 cm−<sup>1</sup> D) Below 1500 cm−<sup>1</sup>


A) Above 2850 cm−1
B) Between 2850 and 2000 cm−1
C) Between 2000 and 1500 cm−1
D) Below 1500 cm−1

E) A) and B)
F) A) and C)

Correct Answer

verifed

verified

Refer to instructions. M+ at m/z = 216


A) C6H13OCl
B) C4H8Br2
C) C10H16
D) C9H12O

E) C) and D)
F) B) and D)

Correct Answer

verifed

verified

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

Correct Answer

verifed

verified

The peak at m/z = 43 is the base peak.

Below is the mass spectrum of an unknown hydrocarbon. In addition, this hydrocarbon shows characteristic absorption at 2100 cm−1 in its IR spectrum. Give the structure of this unknown. Below is the mass spectrum of an unknown hydrocarbon. In addition, this hydrocarbon shows characteristic absorption at 2100 cm−<sup>1</sup> in its IR spectrum. Give the structure of this unknown. (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/) (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/)

Correct Answer

verifed

verified

The formula weight of 54 corresponds to ...

View Answer

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm−1 (sharp peak) and 2150 cm−1 (sharp peak) ?


A)
Which of the following compounds gives an infrared spectrum with peaks at 3300 cm−<sup>1</sup> (sharp peak) and 2150 cm−<sup>1</sup> (sharp peak) ? A) B) C) D)
B)
Which of the following compounds gives an infrared spectrum with peaks at 3300 cm−<sup>1</sup> (sharp peak) and 2150 cm−<sup>1</sup> (sharp peak) ? A) B) C) D)
C)
Which of the following compounds gives an infrared spectrum with peaks at 3300 cm−<sup>1</sup> (sharp peak) and 2150 cm−<sup>1</sup> (sharp peak) ? A) B) C) D)
D)
Which of the following compounds gives an infrared spectrum with peaks at 3300 cm−<sup>1</sup> (sharp peak) and 2150 cm−<sup>1</sup> (sharp peak) ? A) B) C) D)

E) B) and D)
F) A) and B)

Correct Answer

verifed

verified

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

Correct Answer

verifed

verified

This compound should show a me...

View Answer

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


A) M+ − 15
B) M+ − 18
C) M+ − 21
D) M+ − 29

E) A) and B)
F) None of the above

Correct Answer

verifed

verified

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


A) mass spectrometry
B) infrared spectroscopy
C) ultraviolet spectroscopy
D) nuclear magnetic resonance spectroscopy

E) None of the above
F) A) and D)

Correct Answer

verifed

verified

A

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

Correct Answer

verifed

verified

UV will show a diffe...

View Answer

What is the vertical axis of a mass spectrum?


A) mass
B) energy
C) abundance
D) field strength

E) C) and D)
F) All of the above

Correct Answer

verifed

verified

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?

Correct Answer

verifed

verified

a) To use IR spectroscopy to distinguish between isomers, find a strong IR absorption present in one isomer that is absent in the other isomer. 11eab600_0867_b1e1_9625_fb7e97ffbb66_TB6688_00 11eab600_0867_d8f2_9625_01e660637f96_TB6688_00 alkene peak at 3020−3100 cm−1 and at 1650−1670 cm−1 no alkene peaks no alkyne peaks alkyne peak of medium intensity at 2100−2260 cm−1 b)Although the M+ peak (82) for both would be the same, the fragmentation pattern would be different. Mass spectrum: 2-hexyne 11eab600_0867_d8f3_9625_f3f99f82a8ca_TB6688_00 Mass spectrum: Cyclohexene 11eab600_0868_0004_9625_0785e1ad195f_TB6688_00 (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/)

Which of the following compounds would have the longest λmax in the UV region of the electromagnetic spectrum? A Which of the following compounds would have the longest λ<sub>max</sub> in the UV region of the electromagnetic spectrum? A B C ​ A) A B) B C) C D) All would have the same λ<sub>max</sub>. B Which of the following compounds would have the longest λ<sub>max</sub> in the UV region of the electromagnetic spectrum? A B C ​ A) A B) B C) C D) All would have the same λ<sub>max</sub>. C Which of the following compounds would have the longest λ<sub>max</sub> in the UV region of the electromagnetic spectrum? A B C ​ A) A B) B C) C D) All would have the same λ<sub>max</sub>. ​


A) A
B) B
C) C
D) All would have the same λmax.

E) All of the above
F) B) and C)

Correct Answer

verifed

verified

Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. -N−H, C−H, and O−H stretching and bending motions.


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

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

Correct Answer

verifed

verified

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

Correct Answer

verifed

verified

This compound has the formula ...

View Answer

Showing 1 - 20 of 43

Related Exams

Exam 1

Structure and Bonding

29 Questions

Exam 2

Polar Covalent Bonds; Acids and Bases

41 Questions

Exam 3

Organic Compounds: Alkanes and Their Stereochemistry

32 Questions

Exam 4

Organic Compounds: Cycloalkanes and Their Stereochemistry

29 Questions

Exam 5

Stereochemistry at Tetrahedral Centers

40 Questions

Exam 6

An Overview of Organic Reactions

39 Questions

Exam 7

Alkenes and Alkynes

36 Questions

Exam 8

Reactions of Alkenes and Alkynes

38 Questions

Exam 9

Aromatic Compounds

37 Questions

Exam 10

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

42 Questions

Exam 11

Structure Determination: Nuclear Magnetic Resonance Spectroscopy

41 Questions

Exam 12

Organohalides: Nucleophilic Substitutions and Eliminations

43 Questions

Exam 13

Alcohols, Phenols, and Thiols; Ethers and Sulfides

38 Questions

Exam 14

Aldehydes and Ketones: Nucleophilic Addition Reactions

36 Questions

Exam 15

Carboxylic Acids and Nitriles

36 Questions

Exam 16

Carboxylic Acid Derivatives: Nucleophilic Acyl Substitution Reactions

46 Questions

Exam 17

Carbonyl Alpha-Substitution and Condensation Reactions

46 Questions

Exam 18

Amines and Heterocycles

36 Questions

Exam 19

Biomolecules: Amino Acids, Peptides, and Proteins

52 Questions

Exam 20

Amino Acid Metabolism

32 Questions

Exam 21

Biomolecules: Carbohydrates

49 Questions

Exam 22

Carbohydrate Metabolism

45 Questions

Exam 23

Biomolecules: Lipids and Their Metabolism

42 Questions

Exam 24

Biomolecules: Nucleic Acids and Their Metabolism

34 Questions

Exam 26

Orbitals and Organic Chemistry: Pericyclic Reactionse

44 Questions

Exam 27

Synthetic Polymerse

35 Questions

Show Answer