18. Consider the acid-catalyzed hydration reaction provided below:
Which cations and anions among the following are intermediates according to the approved mechanism for the above reaction? 
(A) Only I and II
(B) Only I, II, and III
(C) Only III
(D) Only IV
(E) None of the above. The process is concerted
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統計: A(13), B(0), C(0), D(2), E(1) #3227631
統計: A(13), B(0), C(0), D(2), E(1) #3227631