These are synthesized by reacting an alkoxide with a primary alkyl halide, and these compounds have similar reactivities to sulfides, which are also called "thio" ones of these.
This functional group can be synthesized by reacting alkenes with a per-acid like MCPBA, and two of these functional groups are attached to one carbon in acetals. Industrial quantities of these compounds are formed by the bimolecular dehydration of alcohols, and cyclic versions of these compounds are substituted differently depending on whether they are opened by an acid or a base. These are synthesized by reacting an alkoxide with a primary alkyl halide, and these compounds have similar reactivities to sulfides, which are also called "thio" ones of these. For 10 points, name this these compounds formed in the Williamson synthesis, which have a general formula R-O-R.
This functional group can be synthesized by reacting alkenes with a per-acid like MCPBA, and two of these functional groups are attached to one carbon in acetals.
ethers [accept epoxides before "acetal" but ask for a less specific answer afterwards]