Which of the following polymers is used in the manufacture of chewing gum?

Identify the thermosetting polymer.

Which of the following is a cross-linked, thermosetting polymer?

The polymer used in bulletproof glass is .......

Which of the following contains an ester linkage?

If $\bar{M}_w$ is the weight average molecular weight and $\bar{M}_n$ is the number average molecular weight of a polymer, the poly dispersity index $(PDI)$ of the polymer is given by