CASE STUDIES. Methane, Ethane, Butane,... Analysis shows * composition of C and H only. Conclusion: the molecules are Hydrocarbons: made of C and H only* They cannot take any more H\'s. Conclusion: molecules are Saturated Hydrocarbons, made using C-H single bondsMethyl bromide, ethyl Chloride, ... Conclusion: molecules are made using single bonds.