Which of the following is the most preferred conformation of ethane molecule

Options

A. Staggered
B. Skew
C. Eclipsed
D. None of the above

Answer

To determine the most preferred conformation of the ethane molecule (C2H6), we need to analyze the different conformations that ethane can adopt. Ethane can exist in two main conformations: staggered and eclipsed.

### Step 1: Understand the Structure of Ethane
- Ethane consists of two carbon atoms bonded to each other, with each carbon atom also bonded to three hydrogen atoms.

### Step 2: Identify the Conformations
- **Staggered Conformation**: In this conformation, the hydrogen atoms on one carbon are positioned in between the hydrogen atoms on the other carbon. This arrangement minimizes steric hindrance and torsional strain because the atoms are as far apart as possible.
- **Eclipsed Conformation**: In this conformation, the hydrogen atoms on one carbon are aligned directly with the hydrogen atoms on the other carbon. This arrangement leads to increased steric hindrance and torsional strain because the atoms are closer together.

### Step 3: Compare Stability
- The staggered conformation is more stable than the eclipsed conformation due to the reduced steric hindrance and torsional strain. The hydrogen atoms are positioned at a larger angle (approximately 120 degrees) relative to each other, which minimizes repulsion.

### Step 4: Conclusion
- Therefore, the most preferred conformation of the ethane molecule is the staggered conformation.

### Final Answer:
The most preferred conformation of the ethane molecule is the **staggered conformation**.

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