Which of the following is as a substitute for wool?

Polyacrylonitrile

The correct answer is option 1. Polyacrylonitrile.

Polyacrylonitrile (PAN) is commonly used as a substitute for wool in various textile applications. When PAN fibers are subjected to a process called wet spinning and then treated with certain chemicals, they become similar in texture and appearance to wool fibers. The resulting material is known as acrylic fiber or acrylic wool. Acrylic fibers share several properties with wool, such as softness, warmth, and moisture-wicking ability, making them suitable substitutes for wool in clothing, blankets, and other textile products.

Let us briefly discuss the other options:

2. Polytetrafluoroethene (PTFE), commonly known as Teflon, is a synthetic polymer known for its non-stick properties. It is not used as a substitute for wool.

3. Terylene is a brand name for polyester, which is a synthetic polymer widely used in textiles. While polyester has its own unique properties, it is not typically used as a direct substitute for wool due to differences in texture and warmth.

4. Melamine is a thermosetting plastic used in various applications such as dinnerware, laminates, and flame-retardant coatings. It is not used as a substitute for wool in textiles.

Polyacrylonitrile (PAN) is commonly used as a substitute for wool in textiles, making it the correct choice among the options provided.