Worked Example 10.1 Using Mass Spectra to Identify Compounds Strategy Look at the two possible structures and determine how they differ.Then think about how any of these differences in structure might give rise to differences in mass spectra.Methylcyclohexane, for instance,has a-CH3 group,and ethylcyclopentane has a -CH2CH3 group,which should affect the fragmentation process.Strategy ▪ Look at the two possible structures and determine how they differ. Then think about how any of these differences in structure might give rise to differences in mass spectra. Methylcyclohexane, for instance, has a –CH3 group, and ethylcyclopentane has a –CH2CH3 group, which should affect the fragmentation process. Worked Example 10.1 Using Mass Spectra to Identify Compounds