Find the incorrect statement regarding primary aliphatic amines

Options

A. They can be produced by Gabiel phthalimide process
B. Its solubility is greater than `2^@` amines
C. can be distinguised by Carbylamine test
D. It is less basic than aromatic amines

Answer

To solve the question regarding the incorrect statement about primary aliphatic amines, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Primary Aliphatic Amines**:
- Primary aliphatic amines are compounds where the nitrogen atom is bonded to one alkyl group and two hydrogen atoms. They are derived from straight-chain carbon compounds (aliphatic) and do not have any aromatic characteristics.

2. **Analyzing the Statements**:
- **Statement A**: "Primary aliphatic amines can be produced by the Gabriel thalamide process."
- This statement is **correct**. The Gabriel thalamide process is a well-known method for synthesizing primary amines from thalamide.

- **Statement B**: "The solubility of primary aliphatic amines is greater than that of secondary amines."
- This statement is **incorrect**. Primary amines have a higher number of hydrogen atoms available for hydrogen bonding compared to secondary amines, which leads to greater solubility in water. Therefore, primary amines are more soluble than secondary amines.

- **Statement C**: "Primary aliphatic amines can be distinguished by the carbylamine test."
- This statement is **correct**. The carbylamine test is specific for primary amines, producing a characteristic pungent odor from isocyanides.

- **Statement D**: "Primary aliphatic amines are less basic than aromatic amines."
- This statement is **incorrect**. Primary aliphatic amines are actually more basic than aromatic amines due to the availability of the lone pair of electrons on nitrogen. In aromatic amines, the lone pair is delocalized into the aromatic ring, making it less available for donation.

3. **Conclusion**:
- The incorrect statements regarding primary aliphatic amines are **Statement B** and **Statement D**. However, since the question asks for one incorrect statement, we can conclude that **Statement D** is the most relevant incorrect statement as it directly contradicts the basicity of primary aliphatic amines compared to aromatic amines.

### Final Answer:
The incorrect statement regarding primary aliphatic amines is: **"Primary aliphatic amines are less basic than aromatic amines."**

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