b$)$ For the production of PS$,$ monomer styrene is used:

Would you expect chain growth or step growth to be the predominant

polymerization mechanism for PS $?$ Briefly explain your choice. $(3$ P$)$ c$)$ Please draw the chemical structure of the repeating unit of PS$.(3$ P$)$

d$)$ Briefly explain the designation $$atactic$$ for PS of task a$)$ and draw a simple

sketch that shows atactic PS$.$ Why does atactic PS have an amorphous

structure $?(4$ P$)$