`CHCl_(3)` and KOH on heating with a compound form a bad smelling product compound is

Options

A. `C_(2)H_(5)CN`
B. `C_(2)H_(5)NC`
C. `C_(2)H_(5)OH`
D. `C_(2)H_(5)NH_(2)`

Explanation

To solve the question, we need to identify the compound that reacts with chloroform (CHCl₃) and potassium hydroxide (KOH) to produce a bad-smelling product. This reaction is known as the carbylamine reaction, which specifically involves primary amines.

### Step-by-Step Solution:

1. **Understand the Reaction**: The reaction in question involves chloroform and potassium hydroxide reacting with a compound to produce a bad-smelling product. This is characteristic of the carbylamine reaction.

2. **Identify the Type of Compound Needed**: The compound that will react with chloroform and KOH must contain a primary amine functional group (-NH₂). This is crucial because the carbylamine reaction specifically requires a primary amine.

3. **Analyze the Options**: We need to evaluate the given options to find one that contains a primary amine functional group:
- **Option 1**: Contains a cyanide functional group (-CN) - **Not a primary amine**.
- **Option 2**: Contains an isocyanide functional group (-N≡C) - **Not a primary amine**.
- **Option 3**: Contains an alcoholic functional group (-OH) - **Not a primary amine**.
- **Option 4**: Contains a primary amine functional group (-NH₂) - **This is the correct option**.

4. **Conclusion**: The compound that will react with chloroform and KOH to produce a bad-smelling product (isocyanate) is the one that contains a primary amine functional group. Therefore, the correct answer is **Option 4**.