1 If the invitation says black tie, women should wear a floor-length, evening gown. 2  A tuxedo is mandatory if you're a man. 3  This is your chance to dress as if you were headed to the Oscars. 4  Black tie optional means that wearing a tuxedo or long evening gown is not mandatory, but guests should feel free to do so.
Ether is an organic functional group consisting of a disubstituted oxygen, or an oxygen atom bonded to 2 carbon atoms (if adjacent to a ketone, functional group is then called an ester).
1 The most basic chemical structure of ether is one oxygen atom bonded to two alkyl oâ¦. 2  Learn the Basics About the Chemical Compound Ether There are many different types of ethers. 3  Basically, an ether is any chemical compound that contains one atom of oxygen that is bonded to two aryl or alkyl groups. Student's Guide to Understanding Ethers In organic chemistry, the ether functional group is formed of two alkyl or aryl radicals tied to an oxygen atom: R-O-R'.