Question

Considering the basic strength of amines in aqueous sloution which one has the smallest `pk_(b)` value .
A. `(CH_(3))_(3)N`
B. `C_(6)H_(5)NH_(2)`
C. `(CH_(3))_(2)N`
D. `Ch_(3)NH_(2)`

Answer 1

Correct Answer - C
Smallest `pK_(0)` means highest `K_(b)` value i.e the strongest base Aliphatic amines are more basic than aromatic amines
`(CH_(3))_(2)NHgtCH_(3)NH_(2)gt(CH_(3))_(3)N`
`(CH_(3))_(2)NH` is most basic as the resulting positive ion is most stable on account of `+1` effect of alkyl groups as well as effective solvation of cation .