Alkanes tend to fragment at branch points. The mass spectra for pentane and 2,2-

dimethylpropane (neopentane) are given. Match the compounds to their mass spectra. Why did

you make these assignments?

3.10

Relative Intensity

100

75

S

25

Spectrum A

0

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75

m/z

Relativity Intematy

100

75

50

25

Spectrum B

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75