Which polymer from the following is used as synthetic leather?

$X$ is a polymer, which is mainly used for making unbreakable cups and laminated sheets. The monomers of $X$ are

Select the incorrect option for the following polymer:

Select the biodegradable polymer.

$A$ polymer sample contains $10$ molecules each with molecular mass $5,000$ and $5$ molecules each with molecular mass $50,000$. The number average molecular mass of the polymer sample is

Bakelite is an example of