Which of the following is the strongest base:

Options

A.
B.
C.
D.

Answer

To determine which of the given amines is the strongest base, we will analyze the basicity of each compound based on the availability of the lone pair of electrons on the nitrogen atom. The basicity of amines is primarily influenced by the ability of the nitrogen's lone pair to be donated, which is affected by resonance.

### Step-by-Step Solution:

1. **Identify the Compounds**:
Let's assume we have four amines labeled A, B, C, and D. Each of these amines contains a nitrogen atom with a lone pair of electrons.

2. **Understand Basicity**:
Basicity in amines is related to the availability of the nitrogen's lone pair for donation. The more available the lone pair, the stronger the base.

3. **Analyze Resonance**:
- In compounds A, B, and C, the nitrogen's lone pair is involved in resonance with an adjacent aromatic ring (like a benzene ring).
- This involvement in resonance decreases the availability of the lone pair for donation because it is partially delocalized.

4. **Identify the Exception**:
- In compound D, the nitrogen's lone pair is not involved in resonance. This means that the lone pair is fully localized on the nitrogen atom and is readily available for donation.

5. **Conclusion**:
- Since compound D has its lone pair available for donation and is not involved in resonance, it will be the strongest base among the given options.

### Final Answer:
The strongest base among the given amines is **Option D**.

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