Steric hindrance to hydrogen bonding occurs when the alkyl group is larger than -CH₃, affecting the order of basic strength. The nature of the alkyl group, changing from -CH₃ to -C₂H₅, leads to a shift in the order of basic ...

The order of basicity for aliphatic amines, determined by the stability of substituted ammonium cations, is primary > secondary > tertiary, contrary to the inductive effect-based order.

The basicity of amines is related to their structure, and it depends on the ease of cation formation by accepting a proton. The more stable the cation relative to the amine, the stronger the amine’s basic character.

Aromatic amines are weaker bases than ammonia due to the electron-withdrawing nature of aryl groups. Discrepancies in interpreting Kb values arise from factors like inductive effects, solvation effects, and steric hindrance, influencing the basic strength of amines.

Aliphatic amines are stronger bases than ammonia due to the +I effect of alkyl groups, leading to high electron density on the nitrogen atom. This effect is reflected in their pKb values, which range from 3 to 4.22.