Among the following,the branched chain polymer is

Phenol is used in the manufacture of

Which one of the following structures represents the neoprene rubber?

What is the starting material used to obtain viscose rayon?

The mass average molecular mass and number average molecular mass of a polymer are respectively $40,000$ and $30,000$. The polydispersity index of the polymer will be:

Which of the following pairs is $NOT$ correctly matched?