Acetylene adds on to HCN gives

Options

A. Acetylene cyanide
B. Cyano acetylene
C. Vinyl ethene
D. Acrylonitrile

Explanation

To solve the question "Acetylene adds on to HCN gives," we need to understand the reaction between acetylene (C₂H₂) and hydrogen cyanide (HCN). Here’s a step-by-step breakdown of the reaction:

### Step 1: Identify the Reactants
The reactants in this reaction are acetylene (C₂H₂) and hydrogen cyanide (HCN).

### Step 2: Understand the Reaction Mechanism
Acetylene is an alkyne with a triple bond between the two carbon atoms. When it reacts with HCN, it undergoes an addition reaction. In this reaction, the triple bond of acetylene will break, allowing HCN to add across the carbon atoms.

### Step 3: Write the Reaction
The reaction can be represented as follows:
\[ \text{C}_2\text{H}_2 + \text{HCN} \rightarrow \text{C}_2\text{H}_3\text{CN} \]

### Step 4: Identify the Product
The product formed from the addition of HCN to acetylene is prop-2-enenitrile, also known as acrylonitrile (C₂H₃CN).

### Step 5: Conclusion
Thus, the final product of the reaction between acetylene and hydrogen cyanide is acrylonitrile (C₂H₃CN).

### Final Answer
Acetylene adds on to HCN to give acrylonitrile (C₂H₃CN).

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