Which of the following statements is correct?

Options

A. Primary amines show intermolecular hydrogen bonding
B. Secondary amines show intermolecular hydrogen bonding
C. Tertiary amines show intermolecular hydrogen bonding
D. Amines have lower boiling points as compared to those of alcohols and carboxylic acid of comparable molar masses.

Answer

To determine which of the statements regarding amines is correct, we will analyze each statement step by step.

### Step 1: Understanding Hydrogen Bonding
Hydrogen bonding occurs when a hydrogen atom is covalently bonded to a highly electronegative atom (like nitrogen, oxygen, or fluorine) and is attracted to another electronegative atom. In the case of amines, the electronegative atom is nitrogen.

**Hint:** Remember that hydrogen bonding requires a hydrogen atom bonded to an electronegative atom.

### Step 2: Analyzing the Statements
1. **Statement 1:** Primary amines can form intermolecular hydrogen bonds.
- **Analysis:** Primary amines have two hydrogen atoms attached to the nitrogen atom. This allows them to participate in hydrogen bonding with other primary amine molecules. Therefore, this statement is correct.

2. **Statement 2:** Secondary amines can form intermolecular hydrogen bonds.
- **Analysis:** Secondary amines have one hydrogen atom attached to the nitrogen atom. They can also form hydrogen bonds with other secondary amine molecules. Thus, this statement is also correct.

3. **Statement 3:** Tertiary amines can show intermolecular hydrogen bonding.
- **Analysis:** Tertiary amines have no hydrogen atoms attached to the nitrogen atom (they are bonded to three carbon groups). Therefore, they cannot form hydrogen bonds with other tertiary amine molecules. This statement is incorrect.

4. **Statement 4:** Amines have lower boiling points compared to alcohols and carboxylic acids of comparable molecular mass.
- **Analysis:** Alcohols and carboxylic acids can form stronger hydrogen bonds due to the presence of oxygen, which is more electronegative than nitrogen. This results in higher boiling points for alcohols and carboxylic acids compared to amines of similar molecular mass. Therefore, this statement is correct.

### Conclusion
Based on the analysis:
- The correct statements are 1, 2, and 4.
- The incorrect statement is 3.

Thus, the correct answer is that statements A (primary amines), B (secondary amines), and D (boiling points) are correct, while statement C (tertiary amines) is incorrect.

### Final Answer
The correct statements are A, B, and D.

---