Fill up the blanks with suitable reagents to show synthesis of polyvinyl chloride .
`CH-=CH overset(X)toCH_(2)-=CHCl overset(Y)to(--CH_(2)-CJCl-overset(Cl)overset(|)(C)H--)_(n)`

Options

A. `X=HCl,HgCl_(2)`,Y=Polymerisation,peroxide
B. `X=Cl_(2),FeCl_(3)`,Y=Polymerisation,heat
C. `X=HCl,CuCl`,`Y=H_(2)O,H^(+)`
D. `X=HCl,HgCl_(2)`, Y=Pt,high pressure

Answer

To synthesize polyvinyl chloride (PVC) from acetylene, we need to fill in the blanks with suitable reagents. Let's break down the steps involved in this synthesis.

### Step-by-Step Solution:

1. **Starting Material**: The synthesis begins with acetylene (ethyne), which has the formula \( \text{CH} \equiv \text{CH} \).

2. **Reagent X**: To convert acetylene into a monochloroalkene, we need to add hydrochloric acid (HCl) and mercury(II) chloride (HgCl2). This reaction will lead to the formation of vinyl chloride, which is the compound \( \text{CH}_2=\text{CHCl} \).
- **Reaction**:
\[ \text{CH} \equiv \text{CH} \overset{\text{HCl, HgCl}_2}{\longrightarrow} \text{CH}_2=\text{CHCl} \]
- **Reagents**: HCl and HgCl2.

3. **Reagent Y**: The next step involves the polymerization of vinyl chloride. This process typically requires a peroxide initiator to start the free radical polymerization reaction, leading to the formation of polyvinyl chloride (PVC).
- **Reaction**:
\[ \text{CH}_2=\text{CHCl} \overset{\text{Peroxide}}{\longrightarrow} \text{(--CH}_2\text{-CHCl--)}_n \]
- **Reagent**: Peroxide.

4. **Final Product**: The final product is polyvinyl chloride, represented as \( \text{(--CH}_2\text{-CHCl--)}_n \), where \( n \) indicates the number of repeating units in the polymer chain.

### Summary of Reagents:
- **X**: HCl and HgCl2
- **Y**: Peroxide

### Complete Reaction:
\[ \text{CH} \equiv \text{CH} \overset{\text{HCl, HgCl}_2}{\longrightarrow} \text{CH}_2=\text{CHCl} \overset{\text{Peroxide}}{\longrightarrow} \text{(--CH}_2\text{-CHCl--)}_n \]