Deck 13: Mass Spectrometry Infrared Spectroscopy Uv Vis Spectroscopy

Question 1

The tallest peak in a mass spectrum ____________.

A) is called the molecular ion
B) is called the base peak
C) has the highest charge
D) has the highest isotopic abundance
E) is never the molecular ion

Answer 1

is called the base peak

Question 2

Which of the following is used to provide possible molecular formulas?

A) base peak
B) rule of 13
C) nitrogen rule
D) m/z value
E) M+1 peak

Answer 2

rule of 13

Question 3

The way a molecule fragments in a mass spectrometer depends upon ____________.

A) the bond strengths
B) the stability of the fragment ions
C) the energy of the electron beam that causes ionization
D) the structure of the molecule
E) all of the above

Answer 3

all of the above

Question 4

Which of the following molecules will undergo a McLafferty rearrangement?

A)
B)
C)
D)
E)

Question 5

Which C₇H₁₄O isomer will most likely give prominent peaks at m/z 71 and 43?

A) 2-heptanone
B) 3-heptanone
C) 4-heptanone
D) 2,2-dimethyl-3-pentanone
E) 4,4-dimethyl-2-pentanone

Question 6

Many types of organic spectroscopy use electromagnetic radiation, several of which are listed below. Which type is the highest in energy?

A) radio waves
B) microwaves
C) infrared radiation
D) visible light
E) ultraviolet light

Question 7

The position and shape of an IR absorption band is affected by ____________.

A) electron delocalization
B) electron donation and withdrawal
C) hydrogen bonding
D) bond polarity
E) all of the above

Question 8

What functional group is present in this IR spectrum?

A) alcohol
B) alkyne
C) ketone
D) carboxylic acid
E) C?C

Question 9

What functional group is present in this IR spectrum?

A) alcohol
B) alkyne
C) amine
D) carboxylic acid
E) Ester

Question 10

UV spectroscopy is based upon ____________.

A) stretching and bending of bonds
B) electronic transitions between ground and excited states
C) ionization of molecules by ultraviolet light
D) excitation of nuclei to higher spin states induced by a pulse of electromagnetic
Radiation
E) all of the above