45. The 1
H NMR spectrum of which of the compounds below, all of formula C7H12O2, would consist of three singlets only?

(A) I
(B) II
(C) III
(D) IV
(E) V
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統計: A(3), B(13), C(2), D(3), E(8) #943173
統計: A(3), B(13), C(2), D(3), E(8) #943173