問題詳情
21. The proton NMR spectrum of an unknown compound contains a triplet at 9.8 ppm. Which of the following could be this unknown?
(A) (CH3)3CCHO
(B)CH3CH2CH2CO2H
(C) CH3CH2CH2CHO
(D) CH3CO CH2Ph
(E)PhCHO
參考答案
答案：C
難度：簡單0.714286
統計：A(0),B(0),C(5),D(0),E(2)