Among the following compound which one is planar in shape

Options

A. methane
B. Acetylene
C. Benzene
D. isobutane

Explanation

To determine which of the given compounds is planar in shape, we will analyze each compound based on its hybridization and molecular geometry.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds to analyze are methane, acetylene, benzene, and isobutane.

2. **Analyze Methane (CH₄)**:
- **Hybridization**: The carbon in methane is sp³ hybridized.
- **Geometry**: The geometry of sp³ hybridized molecules is tetrahedral.
- **Planarity**: Since tetrahedral structures have bond angles of approximately 109.5°, methane is **not planar**.

3. **Analyze Acetylene (C₂H₂)**:
- **Structure**: Acetylene has a triple bond between the two carbon atoms (H-C≡C-H).
- **Hybridization**: Each carbon in acetylene is sp hybridized.
- **Geometry**: The geometry of sp hybridized molecules is linear.
- **Planarity**: Linear structures are planar, so acetylene is **planar**.

4. **Analyze Benzene (C₆H₆)**:
- **Structure**: Benzene has a ring structure with alternating double bonds.
- **Hybridization**: Each carbon in benzene is sp² hybridized.
- **Geometry**: The geometry of sp² hybridized molecules is trigonal planar.
- **Planarity**: Since all carbon atoms lie in the same plane, benzene is **planar**.

5. **Analyze Isobutane (C₄H₁₀)**:
- **Structure**: Isobutane has a branched structure.
- **Hybridization**: The carbons in isobutane are sp³ hybridized.
- **Geometry**: As with methane, the geometry is tetrahedral.
- **Planarity**: Therefore, isobutane is **not planar**.

### Conclusion:
Among the compounds analyzed, both acetylene and benzene are planar. However, if only one answer is required, benzene is the most commonly recognized planar compound due to its aromatic nature.

**Correct Answer**: Benzene is planar.