Halogenated compounds are mainly easy to identify by their mass spectra because chlorine as well as bromine occur naturally as mixtures of two abundant isotopes. Chlorine takes place as 35Cl (75.8%) and 37Cl (24.2%); bromine occurs as79Br (50.7%) and 81Br (49.3%).
For the compound Dichloromethane or methylene chloride, CH2Cl2:
Explain at what masses do the molecular ions occur?
Explain what are the percentages of each molecular ion?