The least torsional strain is present in which form of conformers of ethane.A Eclipsed B Staggered C Skew D All are same

The least torsional strain is present in the Staggered form of conformers of ethane.

Here's why:

1. Torsional strain is the resistance to twisting about a bond. It arises from the repulsion between electrons in the bonds that do not share an atom.

2. In the eclipsed conformation of ethane, the hydrogen atoms are directly in front of each other, leading to maximum torsional strain due to the electron-electron repulsion.

3. In the staggered conformation, the hydrogen atoms are as far apart as possible. This arrangement minimizes the electron-electron repulsion, and thus the torsional strain is least.

4. The skew conformation is an intermediate between the eclipsed and staggered conformations, so its torsional strain is between the two.

So, the answer is B, Staggered.