MCQ
The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is
  • A
    the eclipsed conformation of ethane ismore stable than staggered conformation even though the eclipsed conformation has torsional strain
  • the staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain
  • C
    the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain
  • D
    the eclipsed conformation of ethane is more stable than staggered conformation, because eclipsed conformation has notorsional strain.

Answer

Correct option: B.
the staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain
b
Magnitude of torsional strain depends upon the angle of rotation about $\mathrm{C}-\mathrm{C}$ bond. Staggered form has the least torsional strain and the eclipsed form has the maximum torsional strain. So, the staggered conformation of ethane is more stable than the eclipsed conformation.

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