Nylon-$66$ is

Match List-$I$ (polymer) with List-$II$ (monomer/s) and select the correct option:
| List-$I$ (polymer) | List-$II$ (monomer/s) |
| :--- | :--- |
| $(A)$ Bakelite | $(I)$ $2$-Methyl-$1,3$-butadiene |
| $(B)$ Natural rubber | $(II)$ Glycine + Aminocaproic acid |
| $(C)$ Glyptal | $(III)$ Phenol + formaldehyde |
| $(D)$ Nylon $2$-Nylon $6$ | $(IV)$ Phthalic acid + ethylene glycol |

The structure of Nylon $-6$ is

Phenol is used in the manufacture of

Explain the difference between Buna $-N$ and Buna $-S$.

Which of the following statements are correct?
$(1)$ Biodegradable polymers can be converted into essential life substances after degradation.
$(2)$ Non-biodegradable polymers are active towards environmental processes.
$(3)$ Non-biodegradable polymers can be converted into essential life substances.
$(4)$ $PHBV$ is degraded by bacteria under environmental conditions.