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MCQ on IR spectroscopy: Page-1

A compound with molecular weight 72 has shown different peaks in its mass spectra. Select the base peak from the following.

(A) Peak at m/z=29

(B) Peak at m/z=57

(C) Peak at m/z=72

(D) Peak at m/z=73

The peak corresponding to m/z=73 in the above question will be

(A) Fragment ion peak

(B) Molecular ion peak

(C) Quasi molecular ion peak

(D) Metastable ion peak

Which of the following is hard ion source in Mass spectroscopy

(A) Chemical ionization

(B) ESI

(C) FD

(D) Electron ionization

In MS, M+29 peak may observed in

(A) Chemical ionization

(B) ESI

(C) FAB

(D) Electron ionization

5. Identify the ion source that is responsible for the following type of ionization pattern.
MALDI

(A) Chemical ionization

(B) ESI

(C) FAB

(D) MALDI