Increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of $2 -$ fluoro ethanol is:

E c l i p s e, G a u c h e, A n t i

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G a u c h e, E c l i p s e, A n t i

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E c l i p s e, A n t i, G a u c h e

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A n t i, G a u c h e, E c l i p s e

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Solution

The correct option is D $E c l i p s e, G a u c h e, A n t i$

The anticonformation is most stable in which F and OH groups are far apart as possible and minimum repulsion between two groups occurs.
In fully eclipsed conformation F and OH groups are so close that the steric strain is maximum .
Hence this conformation is most unstable.
The order of stability of these conformations is anti > gauche > partially eclipsed > fully eclipsed.

Increasing order of stability is in option A.

Hence,A is the correct answer.

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