Of the following statements :
(a) PMMA is used in making eye lenses.
(b) Nylon-66 is manufactured by caprolactum.
(c) Nylon is the step growth polymer.
(d) Vulcanisation was introduced by Charles Goodyear.

Question

Accepted Answer

Option 2 is the correct answer, which states that statements (a), (c), and (d) are correct. Let's provide a detailed explanation for each statement and why Option 2 is the correct choice.

1. **Statement (a): PMMA is used in making eye lenses.**
   - PMMA stands for Polymethyl methacrylate, which is a transparent thermoplastic often used as a lightweight or shatter-resistant alternative to glass. It is indeed used in making various optical devices, including eye lenses, due to its excellent clarity and optical properties. Therefore, statement (a) is correct.

2. **Statement (c): Nylon is the step growth polymer.**
   - Nylon is a type of synthetic polymer known as a polyamide. It is produced through a step-growth polymerization process, which involves the reaction of monomers with two functional groups. This process is characteristic of step-growth polymers, distinguishing them from chain-growth polymers. Therefore, statement (c) is correct.

3. **Statement (d): Vulcanisation was introduced by Charles Goodyear.**
   - Vulcanization is a chemical process for converting rubber into more durable materials by adding sulfur or other equivalent curatives or accelerators. This process was indeed introduced by Charles Goodyear in 1839, which significantly improved the properties of natural rubber. Therefore, statement (d) is correct.

Now, let's explain why the other options are incorrect:

- **Option 1: (a), (b) तथा (c) सही हैं**
  - Statement (b) is incorrect. Nylon-66 is not manufactured by caprolactam; it is made from hexamethylenediamine and adipic acid. Caprolactam is used in the production of Nylon-6, not Nylon-66. Therefore, Option 1 is incorrect.

- **Option 3: (b), (c) तथा (d) सही हैं**
  - As explained above, statement (b) is incorrect because Nylon-66 is not manufactured by caprolactam. Therefore, Option 3 is incorrect.

- **Option 4: (a), (b) तथा (d) सही हैं**
  - Again, statement (b) is incorrect for the same reason mentioned earlier. Therefore, Option 4 is incorrect.

In conclusion, Option 2 is the correct answer because it accurately identifies the correct statements: (a), (c), and (d).