Which of the following components react to form $Bakelite$?

Polymerization of caprolactam gives .....

Which of the following is a chain-growth polymer?

The following structure represents a subunit of a hydrocarbon polymer that may be prepared by a radical polymerization method. Identify the monomer that has been polymerized to make this polymer chain.

The catalyst used for olefin polymerization is

The product of addition polymerization is .......