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Which statement correctly compares the staggered and eclipsed conformations of ethane?

1. The staggered form of ethane is less stable than the eclipsed form because the staggered form experiences torsional strain.
2. The eclipsed form of ethane is more stable than the staggered form because the eclipsed form has no torsional strain.
3. The staggered form of ethane is more stable than the eclipsed form even though the eclipsed form has torsional strain.
4. The staggered form of ethane is more stable than the eclipsed form because the staggered form has no torsional strain.

Correct answer: The staggered form of ethane is more stable than the eclipsed form because the staggered form has no torsional strain.

Solution

The staggered conformation of ethane is more stable than the eclipsed one because it is free of torsional (eclipsing) strain. The stored statement (eclipsed more stable) is backwards.

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