ethane is obtained in small quantities. Suggest a mechanism for the formation of ethane.

$5\mathrm{.}1$ Determine whether preparation of each of the following polymers would best be achieved via cationic addition or anionic addition.

$5\mathrm{.}1\mathrm{.}1$

$5\mathrm{.}1\mathrm{.}2$

$5\mathrm{.}2$ Many monomers that readily undergo cationic polymerization, such as isobutylene, will not readily undergo anionic polymerization. Styrene, however, can be effectively polymerized via cationic, anionic, or radical addition. Explain.

$5\mathrm{.}3$ A tube of superglue will harden if it remains open too long in a humid environment. Draw a mechanism that shows how superglue polymerizes in the presence of atmospheric

moisture. When drawing your mechanism, make sure to draw the initiation step, at least two propagation steps, and a termination step involving water as the acid.

$5\mathrm{.}4$ Kevlar is a condensation polymer used in the manufacture of bulletproof vests. Identify the monomers required for the preparation of Kevlar.

$5\mathrm{.}5$ Would these pairs of monomers form chain$-$growth or step$-$growth polymers?

$5\mathrm{.}5\mathrm{.}1$

$(2)$