When ethanol is oxidised with excess of chlorine, it gives:

Options

A. `CH_(3)`CHO
B. `"CCl"_(3)`CHO
C. `CH_(3)COCH_(3)`
D. `"CCl"_(3)CH_(2)`CHO

Answer

To solve the question "When ethanol is oxidised with excess of chlorine, it gives:", we will follow these steps:

### Step 1: Identify the Reactants
Ethanol (C2H5OH) is the starting material. It is an alcohol that can undergo oxidation.

**Hint:** Remember that ethanol is a primary alcohol.

### Step 2: Understand the Oxidation Process
When alcohols are oxidized, they can be converted into aldehydes or ketones, depending on the conditions. In this case, we are using excess chlorine, which will lead to further oxidation.

**Hint:** Know that oxidation typically involves the loss of hydrogen or the addition of oxygen.

### Step 3: Write the Reaction
The oxidation of ethanol can be represented as follows:
\[ \text{C}_2\text{H}_5\text{OH} + \text{Cl}_2 \rightarrow \text{C}_2\text{H}_4\text{O} + \text{HCl} \]
Here, ethanol is first converted to acetaldehyde (C2H4O).

**Hint:** Acetaldehyde is the product of the first oxidation step of ethanol.

### Step 4: Further Oxidation with Excess Chlorine
Since we have excess chlorine, the acetaldehyde can be further oxidized. The chlorine will react with the acetaldehyde to form trichloroacetaldehyde (CCl3CHO).

**Hint:** Excess chlorine means that the reaction will continue beyond the first oxidation step.

### Step 5: Write the Final Product
The final product after the complete oxidation of ethanol with excess chlorine is trichloroacetaldehyde (CCl3CHO).

**Hint:** Trichloroacetaldehyde is characterized by having three chlorine atoms attached to the carbon adjacent to the carbonyl group.

### Conclusion
Thus, when ethanol is oxidized with excess chlorine, it gives trichloroacetaldehyde (CCl3CHO).

**Final Answer:** CCl3CHO (Trichloroacetaldehyde)