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Which amine exhibits the highest basicity due to the presence of two electron-donating groups on the nitrogen atom, considering that aromatic amines are generally less basic than aliphatic amines?

1. Secondary amine (R2NH)
2. Primary amine (RNH2)
3. Aromatic amine with one alkyl group (C6H5NHCH3)
4. Ammonia (NH3)

Correct answer: Secondary amine (R2NH)

Solution

The compound (CH3)2NH (R2NH) is most basic because the two electron-releasing methyl groups increase the electron density on nitrogen, enhancing its ability to donate a lone pair. Aromatic amines like C6H5NHCH3 are less basic due to resonance delocalization of the lone pair into the aromatic ring.

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