Which of the following monomers form biodegradable polymers?

Which of the following statements is incorrect?

Consider the following sequence of reactions.
$2 CH_3Cl + Si$ $\xrightarrow[573 \ K]{Cu} X$ $\xrightarrow{H_2O} Y$ $\xrightarrow{\text{Polymerization}} Z$
The repeating structural unit in $Z$ is

Given below are two statements:
Statement $I:$ Ethene at $333$ to $343 \ K$ and $6-7 \ atm$ pressure in the presence of $AlEt_3$ and $TiCl_4$ undergoes addition polymerization to give $LDP$.
Statement $II:$ Caprolactam at $533-543 \ K$ in $H_2O$ through step growth polymerizes to give Nylon-$6$.
In the light of the above Statements,choose the correct answer from the options given below:

The polymer that is used as a substitute for wool in making commercial fibres is

The structure of Neoprene is