EXERCISE 14.6 Based on the following EI mass spectrum, which heteroatom -S, Cl, or Br- is present in the molecule that produces this spectrum? 100 80 Relative abundance M+ 100 M+1+ 13 60 60 Relative abundance, % 40 40 20 M+2+ 97 0 20 20 40 40 91 65 65 172 60 60 80 100 120 140 160 180 200 m/z

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