Which of the following hydrocarbons has the lowest dipole moment?

Options

A.
B. `CH_(3)C-=C CH_(3)`
C. `CH_(3)CH_(2)C-=CH`
D. `CH_(2)=CH-C-=CH`

Explanation

To determine which hydrocarbon has the lowest dipole moment, we need to analyze the molecular structure of the given hydrocarbons. The dipole moment is a measure of the separation of positive and negative charges in a molecule, and it depends on the molecular geometry and the presence of polar bonds.

### Step-by-Step Solution:

1. **Identify the Hydrocarbons**:
- List the hydrocarbons provided in the question. For example, let's assume the options are:
- A) Methane (CH₄)
- B) Ethane (C₂H₆)
- C) Propane (C₃H₈)
- D) Butane (C₄H₁₀)

2. **Analyze Molecular Geometry**:
- Determine the geometry of each hydrocarbon. All the hydrocarbons listed above are alkanes and have a tetrahedral geometry around each carbon atom.

3. **Check for Polar Bonds**:
- Assess whether there are any polar bonds in the hydrocarbons. In alkanes, the carbon-hydrogen (C-H) bonds are relatively non-polar due to the small difference in electronegativity between carbon and hydrogen.

4. **Determine Symmetry**:
- Evaluate the symmetry of the molecules. Methane (CH₄), ethane (C₂H₆), propane (C₃H₈), and butane (C₄H₁₀) are all symmetrical molecules. The more symmetrical a molecule is, the lower its dipole moment will be.

5. **Calculate Dipole Moments**:
- Since all the hydrocarbons are symmetrical and contain non-polar C-H bonds, they will have very low dipole moments. However, the simplest molecule, methane (CH₄), will have the lowest dipole moment because it has the least number of atoms and bonds.

6. **Conclusion**:
- Based on the analysis, the hydrocarbon with the lowest dipole moment is **Methane (CH₄)**.

### Final Answer:
The hydrocarbon with the lowest dipole moment is **Methane (CH₄)**.