1. Resonance Effects in Aniline:
* Aniline has a lone pair of electrons on the nitrogen atom that can participate in resonance with the aromatic ring. This delocalizes the electron density, making the lone pair less available for donation to an acid. This reduces the basicity of aniline.
2. Inductive Effects in Cyclohexylamine:
* Cyclohexylamine has no such resonance stabilization. The lone pair on the nitrogen is localized and readily available for protonation. The alkyl groups in cyclohexane have a slight electron-donating inductive effect, which further increases electron density on the nitrogen, making it more basic.
3. Hybridization:
* The nitrogen atom in both molecules is sp3 hybridized. However, the resonance effect in aniline slightly alters the hybridization, making the lone pair less available for donation.
In Summary:
The lack of resonance stabilization in cyclohexylamine, coupled with the inductive effect of the alkyl groups, makes it a stronger base than aniline.
