Which of the following is $NOT$ true for Terylene?

Which of the following polymers is biodegradable?

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 :

Strongest intermolecular forces are present in

Which of the following household plastic materials is used to prepare drinking straws?

If the number average molecular weight and weight average molecular weight of a polymer are $40000$ and $60000$ respectively, the polydispersity index of the polymer will be