14. The mass spectrum of 5-methyl-2-hexanone shows two typical fragments. One is m/z = 43 due to α-cleavage at the more
highly substituted side of the carbonyl group, the other one is m/z = ? due to McLafferty rearrangement.
(A) 51
(B) 54
(C) 56
(D) 58
(E) 60
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