Match List I with List II

List-I (Polymer)	List-II (Nature)
A	I. Thermosetting polymer
B	II. Fibers
C	III. Elastomer
D	IV. Thermoplastic polymer

Polymer $$\mathrm{A}$$ represents:

$$\mathrm{Neoprene}$$

Neoprene is a synthetic rubber.

Rubbers possess weak intermolecular forces, allowing polymer chains to stretch easily.

Hence, neoprene is an:

$$\mathrm{Elastomer}$$

Thus:

$$\mathrm{A \rightarrow III}$$

Polymer $$\mathrm{B}$$ represents:

$$\mathrm{Nylon\ 6,6}$$

Nylon contains strong intermolecular hydrogen bonding between polymer chains.

This gives high tensile strength and close packing of chains.

Hence, nylon behaves as a:

$$\mathrm{Fiber}$$

Thus:

$$\mathrm{B \rightarrow II}$$

Polymer $$\mathrm{C}$$ represents:

$$\mathrm{Polyvinyl\ Chloride\ (PVC)}$$

PVC softens on heating and hardens on cooling without undergoing chemical change.

This is the characteristic property of:

$$\mathrm{Thermoplastic\ Polymers}$$

Thus:

$$\mathrm{C \rightarrow IV}$$

Polymer $$\mathrm{D}$$ represents:

$$\mathrm{Phenol\text{-}Formaldehyde\ Resin}$$

On heating, extensive cross-linking occurs, producing a rigid three-dimensional network.

Once formed, it cannot be remelted or reshaped.

Hence, it is a:

$$\mathrm{Thermosetting\ Polymer}$$

Thus:

$$\mathrm{D \rightarrow I}$$

Therefore, the correct matching is:

$$\mathrm{A\text{-}III,\ B\text{-}II,\ C\text{-}IV,\ D\text{-}I}$$