Chromic acid oxidises acetylene into:

Options

A. oxalic acid
B. acetic acid
C. acetaldehyde
D. `CO_(2)+H_(2)O`

Answer

To solve the question of what product is formed when chromic acid oxidizes acetylene (ethyne), we can follow these steps:

### Step 1: Identify the structure of acetylene
Acetylene, also known as ethyne, has the molecular formula C2H2. Its structure consists of two carbon atoms connected by a triple bond, with each carbon atom also bonded to one hydrogen atom:
\[ \text{H-C≡C-H} \]

### Step 2: Understand the nature of chromic acid
Chromic acid (H2CrO4) is a strong oxidizing agent. It can oxidize various organic compounds, including alkynes like acetylene.

### Step 3: Determine the oxidation reaction
When acetylene is treated with chromic acid, it undergoes oxidation. The triple bond in acetylene is converted into a double bond, and the terminal hydrogen atoms are replaced by hydroxyl groups (OH) as the oxidation proceeds.

### Step 4: Identify the final product
The oxidation of acetylene by chromic acid leads to the formation of acetic acid (ethanoic acid). The reaction can be summarized as follows:
\[ \text{H-C≡C-H} + \text{H2CrO4} \rightarrow \text{CH3COOH} \]
This means that the final product is:
\[ \text{Acetic Acid (CH3COOH)} \]

### Conclusion
Therefore, the product formed when chromic acid oxidizes acetylene is acetic acid.