Question

Increasing order of stability among the three main conformations (i.e., anti, eclipse, gauche) of $2-\text{flouro ethanol}$ is:

• A. $\text{Eclipse<Anti<Gauche}$
• B. $\text{Anti<Gauche<Eclipsed}$
• C. $\text{Eclipse<Gauche<Anti}$
• D. $\text{Gauche<Eclipse<Anti}$

Answer 1

The correct option is A $\text{Eclipse<Anti<Gauche}$



Due to hydrogen bonding between $H$ and $F$, gauche conformation is most stable. Hence, the correct order is eclipse, anti and gauche.