An organic compound A having molecular formula `C_2 H_7 N` on treatment with `HNO_2` gave the oily yellow substance. Identify A.

Explanation

To identify the organic compound A with the molecular formula C2H7N, which reacts with HNO2 to produce an oily yellow substance, we can follow these steps:

### Step 1: Analyze the Molecular Formula
The molecular formula C2H7N indicates that the compound contains 2 carbon atoms, 7 hydrogen atoms, and 1 nitrogen atom. This suggests that the compound is likely an amine because of the presence of nitrogen.

**Hint:** Look for common amines that fit the molecular formula C2H7N.

### Step 2: Identify Possible Structures
...