Question

Which among following monomers is used to prepare PVC?

• A.

  

• B.

  

• C.

  

• D.

  

Hint:

Common vinylic monomers to memorize for exams:
Vinyl chloride ($\text{CH}_2\text{=CHCl}$) $\rightarrow$ PVC
Styrene ($\text{Ph-CH=CH}_2$) $\rightarrow$ Polystyrene
Tetrafluoroethylene ($\text{CF}_2\text{=CF}_2$) $\rightarrow$ Teflon
Acrylonitrile ($\text{CH}_2\text{=CH-CN}$) $\rightarrow$ PAN (Orlon)

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
The question asks us to identify the chemical structure of the specific monomer unit utilized in the polymerization of PVC.

Step 2: Key Formula or Approach:
The acronym PVC stands for Polyvinyl Chloride.
Polymers are generally named after the monomers they are synthesized from. Therefore, the monomer for Polyvinyl chloride is simply "vinyl chloride".

Step 3: Detailed Explanation:
The "vinyl" group in organic chemistry refers specifically to the ethenyl functional group, which has the structure $\text{-CH=CH}_2$.
When a chlorine atom is attached to this vinyl group, the resulting molecule is vinyl chloride (IUPAC name: chloroethene).
The chemical structure of vinyl chloride is $\text{CH}_2\text{=CH-Cl}$.
During the addition polymerization process, the pi bond of the carbon-carbon double bond breaks, and the molecules link together to form the long alkane-like chain of Polyvinyl Chloride: $\text{-(CH}_2\text{-CH(Cl))-}_n$.
Assuming the standard structure order for this question block, the visual representation of $\text{CH}_2\text{=CH-Cl}$ matches the first option placeholder.

Step 4: Final Answer:
The monomer used to prepare PVC is vinyl chloride ($\text{CH}_2\text{=CH-Cl}$), matching option (A).