Figure shows the mass spectrum of the same compound from an electron- impact ion

Question

Figure shows the mass spectrum of the same compound from an electron- impact ionization source and an ionization source. Figure: Electron-impact spectrum (a) and chemical ionization spectrum (b) of the same biologically important compound. (From H. M. Fales, H. A. Lloyd, and G. A. W. Milne, J. Amer. Chem. Soc., 1970, 92, 1590-1597. American Chemical Society.) (a) Which mass spectrum would be best for determining the molecular mass of the compound? Why? (b) Which mass spectrum would be best for determining the chemical structure? Why? (c) Which spectrum is which? How do you know?

Explanation / Answer

a) Second spectra is best for find out the mass because it molecular ion peak at166.

b)Second spectra is best for find out the structure because it has fragmention peaks

c) second spetrum is EI spectrum, first one is CI spectrum

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