6. What is the order of increasing acidity for the following compounds?
(A) IV < I < II < III
(B) III < II < I < IV
(C) III < II < IV < I
(D) IV < II < I < III
(E) I < IV < II < III
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統計: A(1), B(37), C(6), D(0), E(1) #2053803
統計: A(1), B(37), C(6), D(0), E(1) #2053803