7. Look at the number of carbon and hydrogen atoms in methane, ethane, and propane. a. What is the difference in the number of carbon atoms between methane and ethane? b. Between ethane and propane? c. What is the difference in the number of hydrogen atoms between methane and ethane? d. Between ethane and propane? 8. What is the name for the 6 -carbon alkane? What is the formula of this compound? B. Structural Isomerism From a structural formula (2D drawing) of dichloromethane, CH2Cl2, it would appear that two different isomers exist. Make these and name them using the rules for naming to answer the question/ Are these, in fact, isomers