`CH-=CHoverset(Ni(CN)_2)rarrX` . Identify X in the given reaction

Options

A. Ethane
B. Benzene
C. Cycloctatetraene
D. Cyclohexane

Answer

To solve the question, we need to analyze the reaction of ethyne (acetylene) with nickel cyanide (Ni(CN)₂) as a catalyst.

### Step-by-Step Solution:

1. **Identify the Reactant**:
The reactant is ethyne, which has the molecular formula C₂H₂ and can be represented as CH≡CH.

2. **Understand the Reaction Conditions**:
The reaction occurs in the presence of nickel cyanide (Ni(CN)₂) as a catalyst and under high pressure.

3. **Determine the Reaction Type**:
Under these conditions, ethyne can undergo a process known as polymerization. Specifically, four molecules of ethyne can combine to form a larger cyclic compound.

4. **Polymerization of Ethyne**:
When four molecules of ethyne react, they can form a compound known as cyclooctatetraene. The structure of cyclooctatetraene consists of a cyclic arrangement of eight carbon atoms with alternating double bonds.

5. **Write the Product**:
The product of this reaction is cyclooctatetraene, which can be represented as:
\[ \text{C}_8\text{H}_8 \quad \text{(or)} \quad \text{Cyclooctatetraene} \]

6. **Final Identification**:
Therefore, the compound X formed in this reaction is cyclooctatetraene.

### Conclusion:
The final answer is:
**X = Cyclooctatetraene (C₈H₈)**