`2RCl+Sioverset("Cu power")underset("570 K")rarr R_(2)SiCl_(2)overset(H_(2)O)rarr R_(2)Si(OH_(2))overset("Polymerisation")rarr X,` Then X will be

Options

A. Linear long chain silicone
B. Cyclic silicone
C. Cross linked silicone
D. none of these

Answer

To solve the given question step by step, we will analyze the reactions and transformations described.

### Step 1: Initial Reaction
We start with the reaction of 2RCl with silicon (Si) in the presence of copper powder (Cu) at 570 K.

**Reaction:**
\[ 2RCl + Si \xrightarrow{\text{Cu, 570 K}} R_2SiCl_2 \]

**Explanation:**
- Here, RCl represents an alkyl chloride.
- The silicon reacts with the alkyl chloride to form a compound known as disilicon dichloride, denoted as \( R_2SiCl_2 \).

### Step 2: Hydrolysis
Next, we take the product \( R_2SiCl_2 \) and react it with water (H2O).

**Reaction:**
\[ R_2SiCl_2 + H_2O \rightarrow R_2Si(OH)_2 \]

**Explanation:**
- The presence of water leads to hydrolysis, replacing the chlorine atoms with hydroxyl (OH) groups, resulting in a compound known as dialkyl silanediol, represented as \( R_2Si(OH)_2 \).

### Step 3: Polymerization
Now, we take the product \( R_2Si(OH)_2 \) and subject it to polymerization.

**Reaction:**
\[ R_2Si(OH)_2 \xrightarrow{\text{Polymerization}} X \]

**Explanation:**
- The dialkyl silanediol can undergo condensation reactions, where the hydroxyl groups can react with each other, leading to the formation of siloxane bonds (Si-O-Si).
- This process results in the formation of a polymeric structure.

### Final Product
The final product \( X \) is a polymer formed from the repeated units of \( R_2SiO \).

**Conclusion:**
The product \( X \) is a linear long-chain silicon polymer, which is characterized by a repeating unit of siloxane linkages.

### Answer:
Thus, the final answer is **linear long chain silicon** (Option A).

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