Which of the following is the weakest base in aqueous solution?

[Smooth Operater]

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Which of the following is the weakest base in aqueous solution?

A. OH–
B. NH2
C. HSO4
D. CH3COO–
E. NH3

I know you should look for the strongest conjuated acid which is H2SO4 in this question, so C is the correct answer.

But what if I don't know H2SO4 is a strong acid, is there other way to figure out this question ? like looking at number of e pairs? Thanks

 

[GRAD]

the weakest base is the strongest deactivator

 

[Smooth Operater]

"deactivator"??? how can we tell which one is strongest deactivator?