Which of the following compound is the most basic?

Options

A.
B.
C.
D.

Answer

To determine which compound is the most basic among the given options, we need to analyze the structure of each compound and the factors that influence basicity.

### Step-by-Step Solution:

1. **Understanding Basicity**: Basicity refers to the ability of a compound to donate a lone pair of electrons. The more readily a compound can donate its lone pair, the more basic it is. Factors that influence basicity include electron density and the presence of electron-withdrawing or electron-donating groups.

2. **Analyzing Option A**:
- In this compound, the nitrogen atom has a lone pair that can potentially be donated. However, this lone pair is involved in conjugation with a nearby aromatic ring, which decreases its availability for donation. Therefore, the basicity is reduced.

3. **Analyzing Option B**:
- Similar to Option A, this compound also has a nitrogen atom with a lone pair. However, it is affected by a nitro group at the meta position. The nitro group is an electron-withdrawing group (due to its -I effect), which decreases the electron density on the nitrogen, making it less basic.

4. **Analyzing Option C**:
- This compound has a nitrogen atom that can donate a lone pair, but it is also affected by a nitro group. The nitro group is in a position that allows for resonance (conjugation), which significantly reduces the electron density on the nitrogen. Thus, its basicity is also low.

5. **Analyzing Option D**:
- This compound contains a benzene ring with a -CH2-NH2 group. The nitrogen's lone pair is not involved in conjugation with the benzene ring, allowing it to be more available for donation. There are no strong electron-withdrawing groups present, which means the electron density on the nitrogen remains high. Therefore, this compound is expected to be the most basic.

6. **Conclusion**: Based on the analysis, Option D is the most basic compound among the options provided.

### Final Answer:
**The most basic compound is Option D.**