Which statement is not correct ?

Options

A. Methyl amine is more basic than ` NH_3`
B. Amines form hydrogen bonds
C. Ethyl amine has higher boiling point than propane
D. Dimethyl amine is less basic than methy amine

Answer

To determine which statement is not correct regarding amines, we will analyze each statement one by one.

### Step 1: Analyze the first statement
**Statement:** Methylamine is more basic than Ammonia.

**Analysis:**
- Methylamine (CH3NH2) has a methyl group attached to the nitrogen, which is an electron-donating group. This increases the electron density on the nitrogen atom, making it more basic compared to ammonia (NH3), which has no such electron-donating group.
- **Conclusion:** This statement is correct.

### Step 2: Analyze the second statement
**Statement:** Amines form hydrogen bonds.

**Analysis:**
- Amines contain a nitrogen atom bonded to hydrogen, which can participate in hydrogen bonding due to the electronegativity of nitrogen.
- For example, primary amines (RNH2) and secondary amines (R2NH) can form hydrogen bonds with other amines or with water. Tertiary amines (R3N) cannot form hydrogen bonds because they lack hydrogen atoms bonded to nitrogen.
- **Conclusion:** This statement is correct.

### Step 3: Analyze the third statement
**Statement:** Ethyl amine has a higher boiling point than propane.

**Analysis:**
- Ethylamine (C2H5NH2) has hydrogen bonding due to the presence of the nitrogen atom bonded to hydrogen, which increases its boiling point.
- Propane (C3H8) is a non-polar molecule and does not engage in hydrogen bonding, leading to a lower boiling point.
- **Conclusion:** This statement is correct.

### Step 4: Analyze the fourth statement
**Statement:** Dimethylamine is less basic than Methylamine.

**Analysis:**
- Dimethylamine (CH3)2NH has two methyl groups attached to the nitrogen, which increases the electron density on the nitrogen more than in methylamine (CH3NH2), which has only one methyl group.
- More electron density on the nitrogen in dimethylamine means that its lone pair is more available for donation, making it more basic than methylamine.
- **Conclusion:** This statement is incorrect.

### Final Conclusion
The statement that is not correct is **D: Dimethylamine is less basic than Methylamine**.

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