Consider the data below to answer the following question(s).
C 7 H 14 O
IR:
1715 cm− 1
MS:
M + at m/z = 114, α-cleavage fragment at m/z = 71.
McLafferty rearrangement fragment at m/z = 86.
1 H NMR:
0.92 δ (6 H, triplet), 1.59 δ (4 H, multiplet), 2.36 δ (4 H, triplet)
-Refer to instructions. Interpret the mass spectral data.

Question

Consider the data below to answer the following question(s).
C 7 H 14 O
IR:
1715 cm− 1 
MS:
M + at m/z = 114, α-cleavage fragment at m/z = 71.
McLafferty rearrangement fragment at m/z = 86.
 1 H NMR:
0.92 δ (6 H, triplet), 1.59 δ (4 H, multiplet), 2.36 δ (4 H, triplet)
-Refer to instructions. Interpret the mass spectral data.

Quizplus · Accepted Answer

The Answer is A fragment at m/z = 71 indicates a loss of 43, or a C₃H₇ group, from α-cleavage. A fragment at m/z = 86 indicates a loss of 28, or an ethylene group, from McLafferty rearrangement (transfer of a hydrogen atom from the gamma carbon to the carbonyl oxygen with concommitant breaking of the bond between the alpha and beta carbon).

Consider the Data Below to Answer the Following Question(s)