42. Which structure for the compound A (formula C5H8O) that fit the following proton NMR data? Chemical shift δ: 1.55 (singlet, 6H), 2.27 (broad singlet, 1H), 2.46 (singlet, 1H) ppm.
(A)
(B)
(C)
(D) 
(E)
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統計: A(4), B(22), C(2), D(2), E(7) #2053839
統計: A(4), B(22), C(2), D(2), E(7) #2053839