Mass Spectrometry

Question 1

Technique used for measuring the molecular weight and molecular formula of an organic compound

Answer 1

Mass Spectrometry

Question 2

In a mass spectrometer, a sample undergoes in what sequence

A. Ionization
B. Vaporization
C. Acceleration
D. Detection
E. Deflection

Answer 2

BACED

Question 3

Plots the intensity of each ion versus it’s mass to charge ratio

Answer 3

Mass spectrum

Question 4

Tallest peak in a mass spectrum

Answer 4

Base peak

Question 5

The other peaks in mass spectrum are due to ____, wherein molecular ion is decomposed into lower molecular wight fragments

Answer 5

Fragmentation

Question 6

Recall ionization methods

Answer 6

Electron Ionization
Chemical Ionization
Electrospray Ionization
Matrix-assisted laser desorption ionization (MALDI)

Question 7

Most elements present in organic compounds have one major isotope. But smal M+1 peak can be seen due to __.

Answer 7

C-13 isotope, 1.1% of Ca have additional neutron

Question 8

Alkyl chrlorides show two peaks for M and M+2 in a 3:1 ratio due to Cl-35 and Cl-37

Answer 8

Alkyl bromides show two peaks for M and M+2 in a 1:1 ratio due to 79 and 81