Match List I with List II.

A-iii; B-i; C-ii; D-iv

The correct answer is option 3. A-iii; B-i; C-ii; D-iv.

Let us delve into each matched option:

(A) Polystyrene: (iii) Manufacture of toys: Polystyrene is commonly used in the manufacture of toys. Polystyrene is a versatile thermoplastic polymer that is lightweight, rigid, and can be easily molded into various shapes. These properties make it an ideal material for producing toy figurines, model kits, building blocks, and other play items. Polystyrene toys are popular due to their affordability, durability, and ease of customization.

(B) Glyptal: (i) Paints and lacquers : Glyptal is used in paints and lacquers. Glyptal is a type of resin derived from the reaction between glycerol and phthalic anhydride. It is commonly used as a binder or resin in the formulation of paints, coatings, and lacquers. Glyptal-based paints and lacquers provide excellent adhesion, corrosion resistance, and surface finish when applied to metal surfaces. They are commonly used in automotive applications, machinery, and industrial equipment.

(C) PVC: (ii) Raincoats : PVC (Polyvinyl chloride) is used in raincoats. PVC is a widely used thermoplastic polymer known for its versatility, durability, and resistance to moisture and chemicals. PVC-coated fabrics are commonly used in the production of raincoats, umbrellas, and other waterproof garments due to their ability to repel water and provide protection from the elements. PVC raincoats are lightweight, flexible, and easy to clean, making them suitable for outdoor activities in rainy conditions.

(D) Bakelite: (iv) Computer discs: Bakelite is used in the manufacture of computer discs. Bakelite, also known as phenolic resin, is an early synthetic polymer invented by Leo Baekeland in the early 20th century. It is formed through the condensation polymerization of phenol and formaldehyde. Bakelite exhibits excellent electrical insulating properties, heat resistance, and mechanical strength, making it suitable for use in electrical and electronic applications. Bakelite was historically used in the production of early computer discs due to its ability to provide a stable and durable substrate for recording data.

These explanations demonstrate how each matched item in List I corresponds to its respective application or use described in List II.