Answer:
C₃H₈ has a higher boiling point than C₂H₆
Step-by-step explanation:
The boiling point is the temperature at which the intermolecular forces between molecules are overcome and the state of the substance changes from liquid to gas.
Since these are both hydrocarbons (molecules containing just carbon and hydrogen), the strength of their intermolecular bonds should be the same. However, since C₃H₈ is larger, it can form more of these intermolecular bonds. Thus, it takes more energy and a higher temperature to overcome the increased amount of forces.