Application Examine the following spectrum of chlorobenzene Benzene, chloro- MAS

Question

Application Examine the following spectrum of chlorobenzene Benzene, chloro- MASS SPECTRUM 40 201 0.0 20 40 60 80 100 120 m/z NIST Chemistry WebBook (http.l/webbook.nist.gov/chemistry) A. What is the mass of the base peak in this spectrum? B. Write formulas for the ions that produce the three largest peaks Examine the two mass spectra below. One is 1-bromo-4-ethylbenzene and one is 2-bromoethyl benzene. Determine which is which and explain your reasoning. B. MASS SPECTRUM MASS SPECTRUM 6o 120 160 200 80 120 160200 NIST Chemistry WebBook thttp webbook.nist.gowichemistry) NIST Chemistry WebBook Uhttp-liwebbook nist

Explanation / Answer

A) The largest peak or peak with the highest relative intensity in the mass specta of a compound is the base peak of that compound . So, as we can from the spectra the base peak will be 113 m/z.

B) Three largest peaks occur at

m/z = 113 that corresponds to chlorobenzene anion (C6H5Cl35), where Cl35 is the isotope of Cl.

m/z = 115 that corresponds to C6H5Cl37 anion.

  m/z = 77 that corresponds to phenyl cation (C6H5+).

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