Mass Spectroscopy Review

What do the peaks on the mass spectrum represent?

• anions

• mass of positively charged fragments

• mass of negatively charged fragments

• numbers of electrons

Which of the following is NOT a step in the operation of a mass spectrometer?

• Accelerate,

• Deflect

• Radiate

• Ionize

The above Mass Spectra of an unknown substance contains an M⁺ peak of 64 and an M+2 Peak. What is the molecular weight of this substance?

• 29

• 49

• 64

• 66

The above Mass Spectra of an unknown substance contains an M⁺ peak of 64 and an M+2 Peak. Which of the following could be the formula for this substance?

• CH₃CH₂Cl

• CH₃CH₂CH₂NH₂

• CH₃CH₂Br

• CH₃CH₂N₂

The above Mass Spectra of an unknown substance contains an M⁺ peak of 64 and an M+2 Peak. What element do the M/M+2 peaks help us identify the presence of?

• Cl

• Br

• S

• N

What is the molecular weight of this compound?

• 29

• 87

• 54

• 15

Looking at the following Mass Spectra and molecular ion, what element is possibly found in this compound??

• Cl

• N

• Br

• S

Which of the following molecular formulas could correspond to the above mass spectrum?

• C₆H₅Br

• C₆H₅Cl

• C₆H₅CH₂Br

• C₆H₅CH₂Cl

Which of the following fragments could correspond to Peak C?

• ⁺CH₃

• ⁺CH₂CH₃

• ⁺CH₂CH₂CH₃

• ⁺CH₂CH₂CH₂CH₃

Which of the following fragments could correspond to Peak D?

• ⁺CH₃

• ⁺CH₂CH₃

• ⁺CH₂CH₂CH₃

• ⁺CH₂CH₂CH₂CH₃