Basicity Of Amines

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Gas phase basicity order (strongest base first) is typically:

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1. **Basicity Basis**: In the gas phase, the basicity of amines is determined purely by the **electron density** on the Nitrogen atom.
2. **Inductive Effect (+I)**: Alkyl groups (like methyl, $-CH_3$) donate electron density to the Nitrogen atom through the $+I$ effect.
3. **Scaling**: The more alkyl groups attached, the higher the electron density and the easier it is for the Nitrogen to donate its lone pair.
4. **Order**: Tertiary ($(CH_3)_3N$) > Secondary ($(CH_3)_2NH$) > Primary ($CH_3NH_2$) > Ammonia ($NH_3$).
5. **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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Basicity Of Amines

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Correct decreasing basicity order in aqueous solution:

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