For a class project, a group of students are studying the alkanes, a special group of molecules made entirely of carbon and hydrogen atoms. They discover that in nature, alkanes are found in natural gas and oil deposits. They also learn that because they are highly flammable, alkanes are often used as fuels for engines or heating purposes. Through their research, the students create the data table shown below in order to compare the first five alkanes.



Based on the provided chart, which of the alkanes has the same atomic composition as, but different properties from, the molecule shown in the ball-and-stick model below?

ethane


pentane


butane


propane