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The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is


  1. The eclipsed conformation of ethane is more stable than staggered conformation, because eclipsed conformation has no torsional strain

  2. The eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain

  3. The staggered conformation of ethane is more stable than eclipsed conformation, because comparatively staggered conformation has no torsional strain

  4. The staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain


Solution

The correct option is C

The staggered conformation of ethane is more stable than eclipsed conformation, because comparatively staggered conformation has no torsional strain


Torsional strain in molecules is a result of repulsion between the groups. As shown above, they are closer in the eclipsed form and thus experience greater repulsion. 

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