4.已知 NH3 的 Kb = 1.6 ×10−3，CH3NH2 的 Kb = 3.9 ×10−4，C2H5NH2 的 Kb = 4.7 ×10−4，請問三者的鹼性強弱順序，下列何者正確？
(A) NH3＞CH3NH2＞C2H5NH2
(B)C2H5NH2＞CH3NH2＞NH3 
(C) CH3NH2＞NH3＞C2H5NH2
(D) NH3＞C2H5NH2＞CH3NH2 

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統計： A(0), B(0), C(1), D(0), E(0) #2081647