Which of the followin will show least dipole character?

Options

A. Water
B. Ethanol
C. Ethane
D. Ether

Answer

To determine which of the given molecules shows the least dipole character, we need to analyze the molecular structures and their electronegativity differences. Here are the steps to arrive at the solution:

### Step 1: Identify the Molecules
The question mentions four different molecules:
1. Water (H2O)
2. Ethanol (C2H5OH)
3. Ethane (C2H6)
4. Diethyl ether (C4H10O)

### Step 2: Analyze Electronegativity
- **Water (H2O)**: Oxygen is more electronegative than hydrogen, leading to a significant dipole moment.
- **Ethanol (C2H5OH)**: Similar to water, the presence of the hydroxyl group (-OH) means there is a dipole moment due to the electronegativity of oxygen.
- **Ethane (C2H6)**: This molecule consists only of carbon and hydrogen, which have similar electronegativities. Therefore, there is no significant dipole moment.
- **Diethyl ether (C4H10O)**: Contains an ether functional group, which also has a dipole moment due to the electronegativity of oxygen.

### Step 3: Compare Dipole Moments
- **Water**: High dipole moment due to H-O bonds.
- **Ethanol**: High dipole moment due to O-H bond.
- **Ethane**: No dipole moment (nonpolar).
- **Diethyl ether**: Moderate dipole moment due to C-O bond.

### Step 4: Conclusion
Among these molecules, ethane (C2H6) has no dipole moment because it is a nonpolar molecule. Therefore, it shows the least dipole character.

### Final Answer
The molecule that shows the least dipole character is **Ethane (C2H6)**.

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