The synthetic rubber that resembles natural rubber is .....

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

Write a short note on the melamine-formaldehyde polymer.

Which polymer among the following does $NOT$ contain ester linkage in it?

Soft drinks and baby feeding bottles are generally made of $.....$.

Which of the following is used to manufacture plastic crockery?