The compound which on rection with aqueous nirous acid at low temperature produces an oily nitrosamine, is

Options

A. Methyl amine
B. Ethyl amine
C. Diethyl amine
D. Triethyl amine

Answer

To solve the question regarding the compound that reacts with aqueous nitrous acid to produce an oily nitrosamine, we can follow these steps:

### Step 1: Understand the Reactants
The question mentions the reaction of a compound with aqueous nitrous acid (HNO2). It's essential to recognize that nitrous acid reacts differently with various types of amines: primary, secondary, and tertiary.

**Hint:** Identify the type of amine that reacts with nitrous acid to produce nitrosamines.

### Step 2: Identify the Type of Amine
- **Primary amines** react with nitrous acid to produce nitrogen gas and alcohol.
- **Tertiary amines** do not react with nitrous acid.
- **Secondary amines** react with nitrous acid to produce nitrosamines.

Since the question specifies that the reaction produces an oily nitrosamine, we are looking for a secondary amine.

**Hint:** Recall the characteristics of secondary amines and their reactions with nitrous acid.

### Step 3: Example of a Secondary Amine
A common example of a secondary amine is diethylamine (C2H5)2NH. This compound has the structure where two ethyl groups are attached to the nitrogen atom.

**Hint:** Consider common secondary amines that might fit the description.

### Step 4: Reaction with Nitrous Acid
When diethylamine reacts with nitrous acid at low temperature, the following reaction occurs:
\[ (C2H5)2NH + HNO2 \rightarrow (C2H5)2N^+ + H2O \]
This results in the formation of a nitrosamine, specifically diethyl nitrosamine, which is an oily liquid.

**Hint:** Write down the reaction to visualize the formation of the nitrosamine.

### Step 5: Conclusion
Based on the above steps, the compound that reacts with aqueous nitrous acid at low temperature to produce an oily nitrosamine is **diethylamine**.

**Final Answer:** Diethylamine is the compound that, upon reaction with aqueous nitrous acid at low temperature, produces an oily nitrosamine.