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Question

Increasing order of stability among the three main conformations (i.e., eclipse, anti, gauche) of 2-fluoroethanol is:
  1. Eclipse < Anti < Gauche
  2. Gauche < Eclipse < Anti
  3. Anti < Gauche < Eclipse
  4. Eclipse < Gauche < Anti


Solution

The correct option is A Eclipse < Anti < Gauche

Due to hydrogen bonding between H and F gauche conformation is most stable. Eclipsed conformation will be the least stable as it has maximum repulsive interaction.
Hence the correct order is: Eclipse < Anti < Gauche
 

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