Acetylene when treated with `Cl_(2)` in `C(Cl_(4))` forms:

Options

A. mustard gas
B. lewisite
C. westrosol
D. westron

Answer

To solve the question of what product is formed when acetylene is treated with chlorine gas in carbon tetrachloride (CCl4), we can follow these steps:

### Step 1: Understand the Reactants
Acetylene (C2H2) is an unsaturated hydrocarbon with a triple bond between two carbon atoms. When it reacts with chlorine (Cl2), a halogen, we expect a substitution or addition reaction due to the presence of the unsaturated bond.

**Hint:** Identify the structure of acetylene and the nature of the reactants involved.

### Step 2: Reaction Mechanism
When acetylene is treated with chlorine, the chlorine molecule (Cl2) will undergo homolytic cleavage, breaking the Cl-Cl bond and forming two chlorine radicals (Cl•). These radicals can then react with the triple bond of acetylene.

**Hint:** Consider how the chlorine radicals interact with the triple bond of acetylene.

### Step 3: Formation of Intermediate Products
The first addition of chlorine will convert the triple bond into a double bond, resulting in a dichloroalkene. The product formed after the first addition is 1,2-dichloroethene (C2H2Cl2).

**Hint:** Keep track of the number of chlorine atoms added and how they affect the structure of the hydrocarbon.

### Step 4: Further Chlorination
The dichloroalkene can undergo further chlorination. The double bond is still reactive, and another chlorine molecule can add across the double bond, leading to the formation of 1,1,2,2-tetrachloroethane.

**Hint:** Recognize that the addition of chlorine can occur multiple times due to the presence of multiple reactive sites.

### Step 5: Identify the Final Product
The final product, 1,1,2,2-tetrachloroethane, can be named according to IUPAC nomenclature. It has four chlorine substituents on the ethane backbone. The common name for this compound is "Westron."

**Hint:** Use IUPAC naming conventions to confirm the structure of the final product.

### Final Answer
When acetylene is treated with Cl2 in CCl4, the product formed is 1,1,2,2-tetrachloroethane, commonly known as Westron.

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