Which of the following is a thermosetting polymer?

What is a polymer? What can we say about the molecular mass of a polymer? In which four industries are polymers mostly used?

Glyptal is a:

Match List-$I$ with List-$II$ :
| List-$I$ | List-$II$ |
| :--- | :--- |
| $(a)$ Chloroprene | $(i)$ $CH_2=C(CH_3)-CH=CH_2$ |
| $(b)$ Neoprene | (ii) $CH_2=C(Cl)-CH=CH_2$ |
| $(c)$ Acrylonitrile | (iii) $[-CH_2-C(Cl)=CH-CH_2-]_n$ |
| $(d)$ Isoprene | (iv) $CH_2=CH-CN$ |
Choose the correct answer from the options given below :

$Cis-1,4-polyisoprene$ is called:

Identify the use of $Buna-S$ from the following.