| A. | The number of possible theoretical conformations of ethane is 6. |
| B. | In the conformations of ethane, the staggered form has the least torsional strain, and the eclipsed form has the maximum torsional strain. |
| C. | Hückel Rule: The presence of (4n + 2) π electrons in the ring where n is an integer (n = 1, 2, ......). |