Acetylene polymerizes to give

Options

A. benzene
B. polyacetylene
C. butane
D. octane

Explanation

To answer the question "Acetylene polymerizes to give," we can follow these steps:

### Step 1: Understand the Polymerization Process
Acetylene (C₂H₂) can undergo polymerization, which is a chemical process where small molecules (monomers) combine to form a larger molecule (polymer). In this case, acetylene acts as the monomer.

**Hint:** Remember that polymerization involves the combination of smaller units to form larger structures.

### Step 2: Identify the Conditions for Polymerization
The polymerization of acetylene typically requires specific conditions, including the presence of catalysts. In this case, chromium trioxide (CrO₃) and a silica-alumina catalyst are used.

**Hint:** Catalysts are substances that speed up chemical reactions without being consumed in the process.

### Step 3: Determine the Product of Polymerization
When acetylene is polymerized under the right conditions (with chromium trioxide and silica-alumina catalyst), it produces benzene (C₆H₆). This can also occur when acetylene is passed over a red-hot copper tube.

**Hint:** Look for the end product of the reaction, which in this case is a well-known aromatic compound.

### Step 4: Conclude the Answer
Thus, the polymerization of acetylene gives benzene.

**Final Answer:** Acetylene polymerizes to give benzene.