Which of the following are not functional isomers of each other ?

Options

A. `CH_3CH_2NO_2` and `CH_3CH_2ON=O`
B. `C_2H_5CHO` and `CH_3COCH_3`
C. `CH_3CH_2NH_2` and `CH_3NHCH_3`
D. ` C_3H_7NH_2` and `(CH_3)_2 CHNH_2`

Explanation

To determine which of the given compounds are not functional isomers of each other, we need to follow these steps:

### Step 1: Understand Functional Isomers
Functional isomers are compounds that have the same molecular formula but differ in the functional groups present. This means that while they contain the same number of atoms of each element, their chemical properties can be quite different due to the different functional groups.

**Hint:** Remember that functional isomers must have the same molecular formula but different functional groups.

### Step 2: Analyze the Given Compounds
Let's analyze the options provided in the question:

1. **Compound A:** CH₃CH₂NO₂ (Nitroalkane)
2. **Compound B:** CH₃CH₂O (Alkyl nitrite)

- Both have the same molecular formula (C₂H₅NO₂) but differ in functional groups (NO₂ vs O). Therefore, they are functional isomers.

3. **Compound C:** Propanal (Aldehyde, C₃H₆O) and Acetone (Ketone, C₃H₆O)
- Both have the same molecular formula (C₃H₆O) but differ in functional groups (aldehyde vs ketone). They are functional isomers.

4. **Compound D:** Primary amine (CH₃CH₂NH₂) and Secondary amine (NH(CH₃)₂)
- Both have the same molecular formula (C₂H₅N) but differ in the degree of amine (primary vs secondary). They are functional isomers.

5. **Compound E:** Two primary amines (e.g., CH₃CH₂NH₂ and another structure that is also a primary amine)
- Both have the same molecular formula and are both primary amines. Therefore, they are not functional isomers.

### Step 3: Conclusion
After analyzing the options, we find that the last option (Compound E) consists of two primary amines, which means they are not functional isomers of each other.

**Final Answer:** The compounds that are not functional isomers of each other are from **Option E**.

### Summary
- **Functional isomers** share the same molecular formula but have different functional groups.
- **Option E** contains two primary amines, making them not functional isomers.