[" Which form of ethane has the least torsional strain? "],[" (1) Staggered (2) Skew boat "],[" (3) Eclipsed "]

Which of the following conformers of n-butane has torsional strain?

Eclipsed form of ethane has higher energy due to

Assertion: Staggered conformation of ethane is most stable while eclipsed conformation is least stable. ltbr. Reason: Staggered form has the least torsional strain and the eclipsed form has the maximum torsional strain.

In butane, which of the following form has the least stable ?