Small molecules with C'C double bonds, called monomers,
can join with one another to form long chain molecules
called polymers. Thus, acrylonitrile, H2C'CHCN, polymerizes
under appropriate conditions to give polyacrylonitrile,
a common starting material for producing the carbon fibers
used in composites.
(a) Write electron-dot structures for acrylonitrile and polyacrylonitrile,
and show how rearranging the electrons
can lead to formation of the polymer.