Basicity Of Amines
Hardchemistry
Gas phase basicity order (strongest base first) is typically:
Select the correct option:
Solution
Incorrect! Answer:
- Basicity Basis: In the gas phase, the basicity of amines is determined purely by the electron density on the Nitrogen atom.
- Inductive Effect (+I): Alkyl groups (like methyl, −CH3) donate electron density to the Nitrogen atom through the +I effect.
- Scaling: The more alkyl groups attached, the higher the electron density and the easier it is for the Nitrogen to donate its lone pair.
- Order: Tertiary ((CH3)3N) > Secondary ((CH3)2NH) > Primary (CH3NH2) > Ammonia (NH3).
- Note: In aqueous solution, the order changes due to solvation and steric effects (e.g., Secondary > Primary > Tertiary for methyl amines).
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About This Question
- Subject
- chemistry
- Chapter
- nitrogen organics
- Topic
- basicity of amines
- Difficulty
- Hard
- Year
- 2025
Solution
- Basicity Basis: In the gas phase, the basicity of amines is determined purely by the electron density on the Nitrogen atom.
- Inductive Effect (+I): Alkyl groups (like methyl, −CH3) donate electron density to the Nitrogen atom through the +I effect.
- Scaling: The more alkyl groups attached, the higher the electron density and the easier it is for the Nitrogen to donate its lone pair.
- Order: Tertiary ((CH3)3N) > Secondary ((CH3)2NH) > Primary (CH3NH2) > Ammonia (NH3).
- Note: In aqueous solution, the order changes due to solvation and steric effects (e.g., Secondary > Primary > Tertiary for methyl amines).
This hard difficulty chemistry question is from the chapter nitrogen organics, covering the topic of basicity of amines. It appeared in the 2025 exam.
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