2- Methylpentane. mass spectrum

Methylpentane (C.6H]4) has the mass spectrum shown. WTiich peak represents M+ Which is the base peak Propose structures for fragment ions of m z = 71, 57, 43, and 29. Why does the base peak have the mass it does ... 

Figure 15.9 shows the mass spectrum of 2-methylpentane. Branched alkanes tend to cleave on either side of the branch because more stable carbocations result. The two primary cleavage pathways for 2-methylpentane are shown in the following equations ... 

Mass spectrum of 2-methylpentane. The base peak corresponds to loss of a propyl radical to give an isopropyl cation. 

Cation and radical stabilities help to explain the mass spectra of branched alkanes as well. Figure 12-19 shows the mass spectrum of 2-methylpentane. Fragmentation of a branched alkane commonly occurs at a branch carbon atom to give the most highly substituted cation and radical. Fragmentation of 2-methylpentane at the branched carbon atom can give a secondary carbocation in either of two ways ... 

What m/z value is most likely for the base peak in the mass spectrum of 3-methylpentane ... 

The mass spectrum of 2-methylpentan-3-ol is shown in Figure 10.8. What... 

The three compounds hexane, 2-methylpentane, and 3-methyl-pentane correspond to the three mass spectra shown below. Match each compound with the spectrum that best fits its structure on the basis of the fragmentation pattern. 

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