Answer
All ethers have an O atom with two single bonds to different R groups as shown: R-O-R
Diethyl ether is $CH_3-CH_2-O-CH_2-CH_3$ and Dimethyl ether is $CH_3-O-CH_3$
Work Step by Step
All ethers have an O atom with two single bonds to different R groups as shown: R-O-R
Diethyl ether is $CH_3-CH_2-O-CH_2-CH_3$ and Dimethyl ether is $CH_3-O-CH_3$