Problem 30 - Arihant Objective Approach to Organic Chemistry for IIT JEE and NEET all Medical Entrances Part 4

Question

Nylon-6 is obtained from : \(\quad\) (a) caprolactam (b) butadiene (c) adipic acid (d) tetrafluoroethylene

Step-by-Step Solution

Answer

Nylon-6 is obtained from (a) caprolactam.

Step 1: Understanding Nylon-6

Nylon-6 is a type of synthetic polymer, specifically a polyamide, which is used widely in textiles and plastics. It is important to know the chemical structure and how it is formed to identify the precursor used in its production.

Step 2: Analyzing the Options

We have four options: (a) Caprolactam (b) Butadiene (c) Adipic acid (d) Tetrafluoroethylene We need to identify which of these compounds is the precursor for Nylon-6.

Step 3: Identifying the Precursor

Nylon-6 is made through the ring-opening polymerization of caprolactam. Caprolactam contains a 7-membered ring that opens up to form the polyamide chain characteristic of Nylon-6. Butadiene, adipic acid, and tetrafluoroethylene do not form Nylon-6 and are related to different types of polymers or materials.

Step 4: Selecting the Correct Answer

Based on the chemical process of producing Nylon-6, the correct compound from which Nylon-6 is obtained is caprolactam. Therefore, the right answer to the given question is (a) caprolactam.

Key Concepts

Caprolactam

Caprolactam is a crucial organic compound in the production of Nylon-6. It is a lactam, which is a cyclic amide, and possesses a 7-membered ring structure. This ring structure plays a vital role in the polymerization process that leads to forming Nylon-6. Caprolactam is derived from cyclohexanone through a series of chemical reactions, including Beckmann rearrangement.
When heated, caprolactam undergoes ring-opening, leading to the polymerization process. This process results in long chains of Nylon-6, characterized by recurring amide linkages. This cyclic structure and its ability to form linear polymers make caprolactam an essential ingredient for producing this widely used synthetic polymer.

Ring-Opening Polymerization

Ring-opening polymerization is a unique form of polymerization where cyclic monomers open up to produce long polymer chains. This process is essential for transforming caprolactam into Nylon-6. The process starts when the 7-membered ring in caprolactam opens up under heat and catalytic conditions.
As the ring opens, the molecule becomes reactive and links with other opened molecules, forming long chains. This effectively turns caprolactam from a single-ring molecule into a repeating chain of nitrogen and carbon atoms, characteristic of the polyamide structure of Nylon-6. The result is a strong and durable polymer, making it ideal for applications in textiles and plastics.

Synthetic Polymer

Synthetic polymers are man-made substances, designed to mimic or enhance the properties of natural polymers. They are created through various polymerization processes, including ring-opening polymerization. Nylon-6 is a leading example of a synthetic polymer produced from caprolactam.
Polymers like Nylon-6 offer distinct advantages:

• High strength and durability
• Resistance to abrasion and chemicals
• Elasticity and flexibility

These characteristics make synthetic polymers incredibly useful in a vast range of applications, from industrial products to everyday items.

Polyamide

Polyamides are a class of polymers that include recurring amide linkages (-CONH-). Nylon-6, derived from caprolactam, is an example of a polyamide. The formation of these amide bonds occurs during the ring-opening polymerization process.
Polyamide chains are known for their strength, chemical resistance, and thermal stability, which is why materials like Nylon-6 are preferred in many applications. Their versatile properties allow polyamides to be shaped into fibers, threads, filaments, and other forms suitable for various industrial and commercial purposes.

Textiles and Plastics

Nylon-6 is a fundamental material in the textiles and plastics industries due to its advantageous properties. In textiles, it is renowned for its strength and elasticity, making it ideal for producing durable fabrics like hosiery, swimwear, and sportswear.
In the plastics industry, Nylon-6 is valued for its rigidity and resilience. It is commonly employed in automotive parts, electronic components, and mechanical gear systems. The versatility afforded by Nylon-6 demonstrates the importance of synthetic polymers across different fields of manufacturing. Overall, the material's performance in both textiles and plastics showcases the benefits of these synthetic advancements.