Mass spectrometry interpretation relies on identifying the molecular ion peak (typically the highest m/z value, with M+1 arising from carbon-13 isotopic abundance) and the base peak (the tallest peak in the spectrum, corresponding to the most stable fragment ion). Halogen content is inferred from isotope-pattern reasoning: an M+2 peak roughly one-third the height of the molecular ion indicates chlorine (from the ~3:1 ratio of chlorine-35 to chlorine-37), while an M+2 peak of comparable height to the molecular ion indicates bromine (from the ~1:1 ratio of bromine-79 to bromine-81); the nitrogen rule further states that an odd molecular ion mass implies an odd number of nitrogen atoms. This belongs to organic chemistry's structural elucidation methods, connecting mass spectrometry to fragmentation theory, carbocation and radical stability (tertiary > secondary > primary), and isotope-based structural inference.
Mass spectrometry interpretation relies on identifying the molecular ion peak (typically the highest m/z value, with M+1 arising from carbon-13 isotopic abundance) and the base peak (the tallest peak…