Answer:
Ether group.
Step-by-step explanation:
Ethers are the compounds that connect two aryl or alkyl groups by an oxygen atom and represented by R–O–R′ where R either aryl or alkyl groups. Ether can be identified by the presence of alKyl groups on either side of the oxygen atom commonly. Diethyl ether, methyl ethyl ether are some of the examples of alkyl ether
Thus, the correct answer is - Ether group.