a) Write down the alpha-cleavages of butanone molecular ion.
b) Ethyl-methyl-propylamine molecular ions can undergo a total of five different alpha-cleavages, three of them resulting in isobaric product ions. Identify these pathways.
c) Below, four isomeric alkylcyclohexanone molecular ions are shown. Decide which of these can be distiguished from the others by means of their product ions from double-alpha cleavage.