21. Given the following acids and Ka values: HClO4 HOAc HCN HF
1 × 107 1.76 × 10-5 4.93 × 10-10 3.53 × 10-4
Which is correct in term of base strength?
(A) CN- ＜ F- ＜ OAc- ＜ ClO4-
(B) CN- ＜ OAc- ＜ F- ＜ ClO4-
(C) ClO4- ＜ OAc-＜ CN- ＜ F-
(D) ClO4-＜ F-＜ OAc- ＜ CN-

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