Why amines are basic in nature? Among dimethylamine (pKb = 3·27) and diethylamine (pKb = 3·0), which one is more basic?
Q.8 Why amines are basic in nature? Among dimethylamine (pKb = 3·27) and diethylamine (pKb = 3·0), which one is more basic?
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Answer: Diethylamine is more basic.
Amines are basic because the nitrogen atom has an unshared (lone) pair of electrons, which it can donate to a proton (Lewis base) or use to accept H+ from water (Brønsted base):
R–NH2 + H2O ⇌ R–NH3+ + OH−
The smaller the pKb, the larger the Kb and the stronger the base. Diethylamine (pKb = 3.0) has a lower pKb than dimethylamine (pKb = 3.27), so diethylamine is the stronger base (the ethyl groups have a greater +I effect).
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· 29 Oct 2026
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