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Increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of 2 - fluoroethanol is
[AIEEE 2006]
- a)Gauche, Eclipse, Anti
- b)Eclipse, Anti, Gauche
- c)Anti, Gauche, Eclipse
- d)Eclipse, Gauche, Anti
Correct answer is option 'B'. Can you explain this answer?
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Increasing order of stability among the three main conformations (i.e....
Gauche conformation is comparatively more stable due to hydrogen linkage in between F and H (atO−atom), hence order is Eclipse, Anti (staggered), Gauche.
Most Upvoted Answer
Increasing order of stability among the three main conformations (i.e....
The stability order among the three main conformations (Eclipse, Anti, and Gauche) of 2-fluoroethanol is Eclipse, Anti, Gauche.
Explanation:
1. Eclipse Conformation:
- In the eclipse conformation, the two largest groups (the F and OH groups) are eclipsed, meaning they are in direct alignment with each other.
- This leads to steric hindrance between the two groups, resulting in repulsive interactions.
- The repulsive interactions destabilize the molecule, making the eclipse conformation the least stable.
2. Anti Conformation:
- In the anti conformation, the two largest groups (the F and OH groups) are opposite to each other, resulting in minimal steric hindrance.
- The anti conformation has the lowest energy due to the absence of repulsive interactions between the two groups.
- Therefore, the anti conformation is more stable than the eclipse conformation.
3. Gauche Conformation:
- In the gauche conformation, the two largest groups are not eclipsed but are not fully anti to each other either.
- The F and OH groups are positioned in a staggered arrangement, resulting in some steric hindrance.
- Although the gauche conformation is more stable than the eclipse conformation, it is less stable than the anti conformation due to the presence of some steric hindrance.
Overall Stability Order:
- Based on the above explanations, the stability order among the three main conformations of 2-fluoroethanol is Eclipse < gauche="" />< />
- Therefore, the correct answer is option B) Eclipse, Anti, Gauche.
Explanation:
1. Eclipse Conformation:
- In the eclipse conformation, the two largest groups (the F and OH groups) are eclipsed, meaning they are in direct alignment with each other.
- This leads to steric hindrance between the two groups, resulting in repulsive interactions.
- The repulsive interactions destabilize the molecule, making the eclipse conformation the least stable.
2. Anti Conformation:
- In the anti conformation, the two largest groups (the F and OH groups) are opposite to each other, resulting in minimal steric hindrance.
- The anti conformation has the lowest energy due to the absence of repulsive interactions between the two groups.
- Therefore, the anti conformation is more stable than the eclipse conformation.
3. Gauche Conformation:
- In the gauche conformation, the two largest groups are not eclipsed but are not fully anti to each other either.
- The F and OH groups are positioned in a staggered arrangement, resulting in some steric hindrance.
- Although the gauche conformation is more stable than the eclipse conformation, it is less stable than the anti conformation due to the presence of some steric hindrance.
Overall Stability Order:
- Based on the above explanations, the stability order among the three main conformations of 2-fluoroethanol is Eclipse < gauche="" />< />
- Therefore, the correct answer is option B) Eclipse, Anti, Gauche.
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