Analytes must be ionized prior to entering the mass filter in a mass spectromete

Question

Analytes must be ionized prior to entering the mass filter in a mass spectrometer. Electron ionization and chemical ionization are two ionization techniques. Which of the following statements are INCORRECT regarding either technique?

I Electron ionization uses an electron beam to create molecular ions, M+•.

II Chemical ionization uses an electron beam to ionize reagent gas.

III Electron ionization gives very little fragmentation of the molecular ion.

IV The ionized reagent gas in chemical ionization undergoes a complex set of chemical reactions before protonating the analyte to create MH+.

V Both ionization techniques give identical mass spectra.

Explanation / Answer

Answer:

IlI Electron ionization gives very little fragmentation of the molecular ion.

Is incorrect statement.

Electron ionization uses an electron beam to create molecular ions, M+•.and,

Electron ionisation gives very large or more fragmentation of the molecular ion.

Chemical ionization uses an electron beam to ionize reagent gas.and ,the chemical Ionization gives very little fragmentation of the molecular ion.

The ionized reagent gas in chemical ionization undergoes a complex set of chemical reactions before protonating the analyte to create MH+.

Finally both ionization techniques give identical mass spectra.

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