Consider the following species at 25 °C.
HOBr (pKa=8.65)
HCN (pKa=9.21)
(CH3)2NH (pKb=3.27)
CH3ONH2 (pKb=4.75)
Which option lists the species in order of increasing basicity (strongest acid first, strongest base last)?
a) HCN, HOBr, CH3ONH2, (CH3)2NH
b) HOBr, HCN, CH3ONH2, (CH3)2NH
c) (CH3)2NH, HCN, CH3ONH2, HOBr
d) HOBr, CH3ONH2, HCN, (CH3)2NH