Which graph represents correct for boiling point of:- (1) Ethane (2) Ethyl alcohol
(3) Acetic Acid

Options

A.
B.
C.
D.

Answer

To determine which graph represents the correct boiling points for ethane, ethyl alcohol, and acetic acid, we need to analyze the boiling points based on the intermolecular forces present in each compound.

### Step-by-Step Solution:

1. **Identify the Compounds and Their Structures**:
- **Ethane (C2H6)**: A simple hydrocarbon with the structure CH3-CH2.
- **Ethyl Alcohol (C2H5OH)**: Contains a hydroxyl group (-OH) which allows for hydrogen bonding.
- **Acetic Acid (C2H4O2)**: Contains two oxygen atoms and can form multiple hydrogen bonds.

2. **Analyze Intermolecular Forces**:
- **Ethane**:
- Only has Van der Waals forces (dispersion forces).
- No hydrogen bonding due to the absence of electronegative atoms.
- **Ethyl Alcohol**:
- Exhibits hydrogen bonding due to the -OH group.
- Also has Van der Waals forces.
- **Acetic Acid**:
- Exhibits stronger hydrogen bonding than ethyl alcohol due to the presence of two oxygen atoms.
- Also has Van der Waals forces.

3. **Determine the Boiling Point Order**:
- The boiling point is influenced by the strength of intermolecular forces:
- **Acetic Acid**: Strongest hydrogen bonding → Highest boiling point.
- **Ethyl Alcohol**: Moderate hydrogen bonding → Intermediate boiling point.
- **Ethane**: Weak Van der Waals forces → Lowest boiling point.
- Therefore, the order of boiling points is:
- Acetic Acid > Ethyl Alcohol > Ethane.

4. **Match with the Given Graphs**:
- Look for the graph that represents the boiling points in the order of Acetic Acid (highest), Ethyl Alcohol (middle), and Ethane (lowest).
- The correct graph will show the highest point for acetic acid, followed by ethyl alcohol, and the lowest point for ethane.

5. **Conclusion**:
- The graph that shows the order of boiling points as Acetic Acid > Ethyl Alcohol > Ethane is the correct representation.

### Final Answer:
The correct graph is the one that shows the boiling point order as Acetic Acid > Ethyl Alcohol > Ethane.

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