The functional group illustrated by R-O-R' is an

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The functional group R-O-R' is called an ether, which is a compound that has two alkyl or aryl groups connected by an oxygen atom. Ethers are commonly used as solvents and anesthetics, and are also found in some natural products such as essential oils. They are different from alcohols (B) which have a hydroxyl (-OH) group and esters (D) which have a carbonyl (C=O) group. Aldehydes (E) have a carbonyl group at the end of the carbon chain. Alkyl (A) refers to a type of substituents, rather than a functional group.

The Functional Group Illustrated by R-O-R' Is an