68. Which of the following sequences ranks the structures below in order of increasing acidity?
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(A) 1 ＜ 2 ＜ 3
(B) 2 ＜ 3 ＜ 1
(C) 3 ＜ 1 ＜ 2
(D) 2 ＜ 1 ＜ 3

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