Torsional strain in eclipsed conformations of a molecule is due to:

repulsion between the eclipsed carbons

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repulsion between aligned electron pairs of the eclipsed bond

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repulsions betwen aligned ‘H’

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repulsions between C-H bonds of eclipsed conformation

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Solution

The correct option is B repulsion between aligned electron pairs of the eclipsed bond
The eclipsed bonds are parallel to each other facing repulsions due to aligned electron pairs in the bonds.

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