Arrange the following compound in decreasing order of boiling point

Options

A. `(CH_(3))_(3)NltCH_(3)NHC_(2)H_(5)ltC_(3)H_(7)NH_(2)ltC_(3)H_(7)OH`
B. `(CH_(3))_(3)NltC_(3)H_(7)NH_(2)ltC_(3)H_(7)OHltCH_(3)NHC_(2)H_(5)`
C. `C_(3)H_(7)NH_(2)ltCH_(3)NHC_(2)H_(5)lt(CH_(3))_(3)NltC_(3)H_(7)OH`
D. `(CH_(3))_(3)NltCH_(3)NHC_(2)H_(5)ltC_(3)H_(7)OHltCH_(3)H_(7)NH_(2)`

Answer

To arrange the given compounds in decreasing order of boiling point, we need to consider the types of intermolecular forces present in each compound. The boiling point is influenced by the strength of these forces, particularly hydrogen bonding in the case of amines and alcohols.

### Step-by-Step Solution:

1. **Identify the Compounds**:
Let's assume the compounds are:
- Compound A: Alcohol (R-OH)
- Compound B: Primary Amine (R-NH2)
- Compound C: Secondary Amine (R2-NH)
- Compound D: Tertiary Amine (R3-N)

2. **Understand Hydrogen Bonding**:
- Alcohols (R-OH) can form strong hydrogen bonds due to the presence of the hydroxyl (OH) group.
- Primary amines (R-NH2) can also form hydrogen bonds, but they are generally weaker than those in alcohols.
- Secondary amines (R2-NH) have one less hydrogen available for bonding compared to primary amines, making their hydrogen bonding slightly weaker.
- Tertiary amines (R3-N) do not have any hydrogen atoms attached to the nitrogen, so they cannot form hydrogen bonds.

3. **Rank Based on Hydrogen Bonding Strength**:
- Alcohols have the strongest hydrogen bonding due to the highly electronegative oxygen atom.
- Primary amines have two hydrogen atoms available for bonding, making them the next strongest.
- Secondary amines, with one hydrogen, come next.
- Tertiary amines, lacking hydrogen for bonding, have the weakest intermolecular forces.

4. **Arrange in Decreasing Order of Boiling Point**:
Based on the strength of hydrogen bonding, we can arrange the compounds as follows:
- **Compound A (Alcohol) > Compound B (Primary Amine) > Compound C (Secondary Amine) > Compound D (Tertiary Amine)**

### Final Order:
1. Alcohol (R-OH)
2. Primary Amine (R-NH2)
3. Secondary Amine (R2-NH)
4. Tertiary Amine (R3-N)