Neoprene is prepared by polymerization of which of the following ?

Question

Accepted Answer

Neoprene is a synthetic rubber that is prepared through the polymerization of 2-chloro-1,3-butadiene, which is also known as chloroprene. This process involves the linking of multiple chloroprene molecules to form a large polymer chain, resulting in neoprene. Neoprene is known for its excellent chemical stability and flexibility over a wide temperature range, making it suitable for various applications such as wetsuits, hoses, and gaskets.

1. **Explanation for Option 1 (2-chloro-1,3-butadiene):**
   - Neoprene is specifically synthesized from the monomer 2-chloro-1,3-butadiene. The presence of the chlorine atom in the monomer is crucial as it imparts unique properties to the resulting polymer, such as resistance to oil, chemicals, and heat. The polymerization of chloroprene involves free radical mechanisms, leading to the formation of neoprene, which is a type of polychloroprene.

2. **Explanation for why other options are incorrect:**

- **Option 2 (2-methyl-1,3-butadiene):**
     - 2-methyl-1,3-butadiene, also known as isoprene, is the monomer used to produce natural rubber, not neoprene. The polymerization of isoprene results in polyisoprene, which has different properties compared to neoprene. Therefore, this option is incorrect for the synthesis of neoprene.

- **Option 3 (1,3-butadiene):**
     - 1,3-butadiene is used in the production of synthetic rubbers such as polybutadiene and styrene-butadiene rubber (SBR), but it is not used to produce neoprene. The absence of a chlorine atom in 1,3-butadiene means it cannot form the chlorinated polymer structure characteristic of neoprene.

- **Option 4 (Acrylonitrile):**
     - Acrylonitrile is a monomer used in the production of polymers like polyacrylonitrile and acrylonitrile butadiene styrene (ABS), but it is not involved in the synthesis of neoprene. Acrylonitrile lacks the necessary structure to form neoprene, which requires the chlorinated structure provided by 2-chloro-1,3-butadiene.

In conclusion, the correct answer is Option 1, as neoprene is specifically synthesized from 2-chloro-1,3-butadiene, and the other options do not provide the necessary chemical structure for the production of neoprene.