77. A molecular cation is produced by McLafferty rearrangement in the mass spectrum of the following compound. How large is its m/z?5d5e2ff6f2300.jpg
(A) 44
(B) 56
(C) 57
(D) 58
(E) 60

答案：登入後查看
統計： A(1), B(0), C(0), D(4), E(0) #2055494