Ethyl alcohol is industrially prepared from ethylene by:

Options

A. Permanganate oxidation
B. Catalytic reduction
C. Absorbing in `H_(2)SO_(4)` followed by hydrolysis
D. Fermentation

Answer

To industrially prepare ethyl alcohol (ethanol) from ethylene, the following steps are involved:

### Step-by-Step Solution:

1. **Starting Material**: Begin with ethylene (C2H4), which is the simplest alkene and has the formula CH2=CH2. Ethylene consists of two carbon atoms connected by a double bond.

2. **Hydration Reaction**: The process to convert ethylene to ethyl alcohol involves a hydration reaction. This is typically done using water (H2O) in the presence of an acid catalyst.

3. **Catalyst Addition**: Add sulfuric acid (H2SO4) as a catalyst. The sulfuric acid helps to protonate the ethylene, making it more reactive. The reaction can be represented as:
\[ \text{C2H4} + \text{H2SO4} \rightarrow \text{C2H5HSO4} \]
Here, ethylene reacts with sulfuric acid to form ethyl hydrogen sulfate.

4. **Hydrolysis**: The next step is hydrolysis, where water is added to the ethyl hydrogen sulfate to produce ethyl alcohol (ethanol). This can be represented as:
\[ \text{C2H5HSO4} + \text{H2O} \rightarrow \text{C2H5OH} + \text{H2SO4} \]
In this step, the ethyl hydrogen sulfate reacts with water, yielding ethyl alcohol and regenerating sulfuric acid.

5. **Final Product**: The final product of this reaction is ethyl alcohol (C2H5OH), which is also known as ethanol.

### Summary of the Reaction:
- Ethylene (C2H4) + H2SO4 → Ethyl hydrogen sulfate (C2H5HSO4)
- Ethyl hydrogen sulfate + H2O → Ethyl alcohol (C2H5OH) + H2SO4