Simple (Symmetrical) Ethers: Ethers in which both
the alkyl groups are same are called simple or symmetrical ethers.
Mixed (Unsymmetrical) Ethers: Ethers in which both
the alkyl groups are different are called mixed or unsymmetrical ethers.
Continuous Etherification Process: This method is used
for the preparation of simple ethers in which excess of alcohol (ethyl
alcohol) reacts with concentrated sulphuric acid to
produce ether continuously.
Williamson's Synthesis: It is the laboratory
method for the preparation of symmetrical as well as unsymmetrical ethers, in
which sodium or potassium alkoxide reacts with an
alkyl halide to produce ether.
Reaction: Reaction in which an atom or a group of atoms in the reactant
is replaced by an attacking nucleophile is called a
nucleophilic substitution reaction.
Nucleophile: The electron rich
species which has a tendency to attack an electron deficient centre in a
substrate is called a nucleophile.