問題詳情

45. The 1H 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

參考答案

答案：B
難度：適中0.5
統計：A(0),B(2),C(0),D(1),E(1)

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