Question

Question #b9f9b

Answer 1

Gauche>Anti>Eclipsed.

Explanation:

Here,we have drawn the Newman structure of this compound.

Now we know the perfectly eclipsed form will have torsional strain ,that will be unstable.

But the partial staggerred form (gauche) form will have chelation between the hydroxyl groups ,so that will be highly stable.

WHICH IS AS FOLLOWS.

Hence the Gauche form is more stable than any form.