問題詳情
20. Using a 60 MHz spectrometer, a chemist observes the following absorption: doublet, J = 7.0 Hz, at δ 4.00. What would thechemical shift (δ) be in the 300 MHz spectrum?
(A) 3.50
(B) 4.00
(C) 4.50
(D) 20.0
(E) 0.80
參考答案
答案：B
難度：適中0.5
統計：A(1),B(2),C(0),D(0),E(0)