Question

What is the functional group contained in the compound `CH_3CH_2-O-CH_2-CH_3`?

Answer 1

ether

Explanation:

When you have R-O-R' (where R and R' are different organic chains) you have an ether functional group.

if R and R' are the same (as they are here) its a symmetrical ether, if they are different its asymmetrical.

The example here is named as ethoxyethane, or diethyl ether.