2-Methyl-3-pentanol, mass spectrum

The mass spectrum of 2-methyl-3-pentanol is shown in Figure 12.8. What fragments can you identify ... 

Mass spectrum of 2-methyl-3-pentanol, Practice Problem 12.3. 

The mass spectrum of straight-chain pentanol isomers, 1-pentanol (Fig. 4.27), 2-pentanol (Figure 4.28), and 3-pentanol (Fig. 4.29) all exhibit very weak molecular ion peaks at miz = 88, while the molecular ion in the mass spectrum of the tertiary alcohol 2-methyl-2-butanol (Fig. 4.30) is entirely absent. The most important fragmentation reaction for alcohols is the loss of an alkyl group via a-cleavage. As discussed earlier, the largest alkyl group is most readily lost. In the spectrum of... 

Following are mass spectra for the constitutional isomers 2-pentanol and 2-methyl-2-butanol. Assign each isomer its correct spectrum. 

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