Leaving Group Ability
Mediumchemistry
Best leaving group among given (in SN1):
Select the correct option:
Solution
Incorrect! Answer:
I−
- Criteria: A good leaving group must be able to stabilize the negative charge after it departs.
- Basicity: Weaker bases are better leaving groups. The order of acidity of hydracids is HI>HBr>HCl>HF.
- Conjugate Bases: Therefore, the order of basic strength is I−<Br−<Cl−<F−.
- Size and Polarizability: Iodide (I−) is the largest and most polarizable. It can spread the negative charge over a much larger volume than the small Fluoride ion.
- Bond Strength: The C−I bond is the longest and weakest, making its cleavage easier.
- Ranking: I−>Br−>Cl−>F−.
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About This Question
- Subject
- chemistry
- Chapter
- halogen organics
- Topic
- leaving group ability
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
I−
- Criteria: A good leaving group must be able to stabilize the negative charge after it departs.
- Basicity: Weaker bases are better leaving groups. The order of acidity of hydracids is HI>HBr>HCl>HF.
- Conjugate Bases: Therefore, the order of basic strength is I−<Br−<Cl−<F−.
- Size and Polarizability: Iodide (I−) is the largest and most polarizable. It can spread the negative charge over a much larger volume than the small Fluoride ion.
- Bond Strength: The C−I bond is the longest and weakest, making its cleavage easier.
- Ranking: I−>Br−>Cl−>F−.
This medium difficulty chemistry question is from the chapter halogen organics, covering the topic of leaving group ability. It appeared in the 2025 exam.
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