Leaving Group Ability
Best leaving group among given (in SN1):
Select the correct option:
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More halogen organics Practice Questions
Chloroform stored with ethanol forms phosgene slowly; ethanol is added to:
Chloroform stored with ethanol forms phosgene slowly; ethanol is added to:
Strong bulky base (t-BuOK) acting on 2-bromobutane favors formation of:
Strong bulky base (t-BuOK) acting on 2-bromobutane favors formation of:
SN2 rate decreases in order:
SN2 rate decreases in order:
2-Bromobutane undergoes SN1 to give racemic mixture because:
2-Bromobutane undergoes SN1 to give racemic mixture because:
Finkelstein reaction converts R–Cl to R–I using NaI in acetone because:
Finkelstein reaction converts R–Cl to R–I using NaI in acetone because:
Elimination-addition (benzyne) mechanism is favored by treatment of chlorobenzene with:
Elimination-addition (benzyne) mechanism is favored by treatment of chlorobenzene with:
Which substrate reacts fastest via SN1 in aqueous ethanol?
Which substrate reacts fastest via SN1 in aqueous ethanol?
Formation of Grignard reagent fails in presence of:
Formation of Grignard reagent fails in presence of:
Wurtz reaction is less suitable for synthesis of unsymmetrical alkanes because:
Wurtz reaction is less suitable for synthesis of unsymmetrical alkanes because:
Sandmeyer reaction converts anilines to aryl bromides via intermediate:
Sandmeyer reaction converts anilines to aryl bromides via intermediate:
Chlorobenzene is less reactive than alkyl chloride in nucleophilic substitution because:
Chlorobenzene is less reactive than alkyl chloride in nucleophilic substitution because:
Benzylic bromides undergo SN1 faster than alkyl bromides due to:
Benzylic bromides undergo SN1 faster than alkyl bromides due to:
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.
Looking for more practice? Explore all chemistry questions or browse halogen organics questions on RankGuru.