Statement -1: Tertiary amines have lower boiling point than secondary amine.
and
Statement-2: Hydrogen bonding is often responsible for increases in boiling point.

Options

A. Statement-1 is true, Statement-2 is true, statement-2 is a correct explanation for statement-1
B. Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement-1
C. Statement-1 is true, statement-2 is False
D. Statement-1 is False, Statement-2 is True.

Answer

To solve the question, we need to analyze both statements regarding amines and their boiling points.

### Step 1: Analyze Statement 1
**Statement 1**: Tertiary amines have lower boiling points than secondary amines.

- **Explanation**: Tertiary amines have the general structure R3N, where R represents alkyl groups. In contrast, secondary amines have the structure R2NH. The key difference is that tertiary amines do not have a hydrogen atom attached to the nitrogen atom, which is crucial for hydrogen bonding.

### Step 2: Analyze Hydrogen Bonding
- **Hydrogen Bonding**: Hydrogen bonding occurs when a hydrogen atom is bonded to a highly electronegative atom (like nitrogen, oxygen, or fluorine) and is attracted to another electronegative atom. In secondary amines, the presence of a hydrogen atom on the nitrogen allows for hydrogen bonding between molecules, which significantly increases the boiling point due to the extra energy required to break these bonds.

### Step 3: Compare Boiling Points
- **Comparison**: Since secondary amines can form hydrogen bonds, they have stronger intermolecular forces compared to tertiary amines, which cannot form hydrogen bonds due to the absence of a hydrogen atom on the nitrogen. Therefore, secondary amines will have higher boiling points than tertiary amines.

### Conclusion for Statement 1
- **Verdict**: Statement 1 is true. Tertiary amines do have lower boiling points than secondary amines due to the lack of hydrogen bonding.

### Step 4: Analyze Statement 2
**Statement 2**: Hydrogen bonding is often responsible for increases in boiling point.

- **Explanation**: This statement is also true. Hydrogen bonding is a strong type of dipole-dipole interaction that requires more energy to overcome compared to other types of intermolecular forces. Thus, compounds that can form hydrogen bonds generally exhibit higher boiling points.

### Conclusion for Statement 2
- **Verdict**: Statement 2 is true. Hydrogen bonding indeed contributes to an increase in boiling point.

### Final Conclusion
Both statements are true, and Statement 2 correctly explains the reasoning behind Statement 1.