Final answer:
The Lewis structure for CF3OCF3 features two double bonds, each between the central oxygen atom and the carbon atoms in the two CF3 groups.
Step-by-step explanation:
The Lewis structure for CF3OCF3 has a total of two double bonds. This molecule consists of two trifluoromethyl groups (CF3) attached to an oxygen atom (O). Each carbon in the CF3 groups is single-bonded to three fluorine atoms and has a single bond to oxygen, except for one carbon, which has a double bond to the oxygen. Therefore, the structure has a double bond between the central oxygen and each carbon of the CF3 groups.