CH3NH2 (methylamine) is more basic than NH2 (ammonia).
Basicity refers to the ability of a molecule or compound to accept a proton (H+) and form a positively charged species. In the case of ammonia (NH3) and methylamine (CH3NH2), the addition of an alkyl group (CH3) to the amino group (NH2) in methylamine increases its basicity compared to ammonia.
The alkyl group in methylamine provides electron-donating properties. It donates electron density towards the nitrogen atom, making the lone pair of electrons on nitrogen more available for protonation. This electron-donating effect stabilizes the positive charge on the resulting ammonium ion (CH3NH3+), making it easier for methylamine to accept a proton compared to ammonia.
Therefore, CH3NH2 (methylamine) is more basic than NH2 (ammonia) due to the presence of the alkyl group, which enhances the basicity of the nitrogen atom.