Define the organic substances called ethers. Write the general formula for an ether as R'-O-R". Determine that it is composed of two organic molecules, either alkanes or cyclic or a combination of both with an oxygen atom attached to the central ether carbon. Determine the simplest ether is composed of two methyl groups with an oxygen between them. CH3-O-CH3, Explain the Nomenclature, and name the ether as dimethyl ether. Discuss some of the physical and chemical properties of ethers and their original use as general anaesthetics.