Here's why:
* Electronegativity: Nitrogen is more electronegative than carbon. This means that nitrogen attracts electrons more strongly in the C-N bond.
* Electron Density: As a result, the electron density in the C-N bond is shifted towards the nitrogen atom, making the carbon atom slightly electron-rich.
* Formal Charge: While not a true charge, the formal charge on carbon in methylamine is 0. However, the electronegativity difference creates a partial negative charge on the carbon atom.
Therefore, the carbon atom in methylamine carries a partial negative charge, which is estimated to be around -0.3.
