Which of the following has maximum Boiling point

Options

A. Methoxy ethane
B. n-Butane
C. Propanal
D. Acetone

Answer

To determine which of the given compounds has the maximum boiling point, we need to analyze the molecular structures and the types of intermolecular forces present in each compound. Here's a step-by-step solution:

### Step 1: Identify the Compounds
The compounds given are:
1. Methoxyethane (C2H6O)
2. Normal butane (C4H10)
3. Propanol (C3H8O)
4. Acetone (C3H6O)

### Step 2: Analyze Intermolecular Forces
- **Methoxyethane**: This is an ether, which primarily exhibits Van der Waals forces and some dipole-dipole interactions due to the presence of the oxygen atom.
- **Normal butane**: This is a straight-chain alkane, which primarily exhibits Van der Waals forces (dispersion forces) as it lacks polar functional groups.
- **Propanol**: This is an alcohol, which can form hydrogen bonds due to the presence of the hydroxyl (-OH) group. Hydrogen bonding is a strong type of dipole-dipole interaction.
- **Acetone**: This is a ketone, which also exhibits dipole-dipole interactions and can engage in some hydrogen bonding, though not as effectively as alcohols.

### Step 3: Compare the Strength of Intermolecular Forces
- **Hydrogen bonding** (found in propanol) is generally stronger than dipole-dipole interactions (found in acetone and methoxyethane) and much stronger than Van der Waals forces (found in normal butane).
- Among the compounds, propanol has the ability to form hydrogen bonds, which significantly increases its boiling point.

### Step 4: Determine the Compound with the Maximum Boiling Point
Given the analysis:
- **Propanol** has the strongest intermolecular forces due to hydrogen bonding, followed by **acetone** and **methoxyethane** (both with dipole-dipole interactions), and lastly **normal butane** which has the weakest Van der Waals forces.

### Conclusion
Thus, **propanol** has the maximum boiling point among the given compounds.

### Final Answer
**Propanol** has the maximum boiling point.

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