Final answer:
The compound CH3-CH2-O-CH2-CH3 contains the ether functional group and can be named ethylmethyl ether or methoxyethane.
Step-by-step explanation:
The student has asked which of the listed compounds contains an ether functional group. An ether is characterized by an -O- linkage where two carbon chains are connected through an oxygen atom. Based on the structures provided, the compound CH3-CH2-O-CH2-CH3 represents an ether because it has the general structure of R-O-R', with 'R' and 'R'' being alkyl groups. This compound would commonly be named ethylmethyl ether in the common name system, or methoxyethane in the IUPAC system.