Saturn's moon that rains hydrocarbons to form liquid methane and ethane lakes is Titan
Answer: Titan
Step-by-step explanation:
The Lakes of Titan is the largest moon of the Saturn which rains hydrocarbons and it forms liquid methane and ethane. The large ones are named as Maria and the smaller ones are called as Lacus. Like water on earth in Titan there are liquid methane lake.
In the polar regions of the Saturn there were traces of lakes which were to be the long term hydrocarbon lakes. It has been found that there are 300 times more reserves of oil in Titan than Earth. The methane in Titan reacts with the ultraviolet radiation to form ethane.