Based on the relative stability of the conjugate acids, which of the following bases has the largest value for Kb?

a. CH3NH2
b. NH2NH2
c. HONH2
d. ClNH2

2 answers

Do you have the stabilility of the conjugate acids somwhere? What are they?
Kb = Kw/Ka so if you have the Ka value for each of those listed you can calculate Kb. Then you can compare the Kb values.
a