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which carbon-carbon bonds in this molecule are the least likely to be ionized and break when...

which carbon-carbon bonds in this molecule are the least likely to be ionized and break when struck by a beam of electrons? why?

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Answer #1

In a given compound there are many electrons present which can be ionize/ejected at apropriate energy, but the most probable ejection will be of an electron that is least tightly bound. Hence, it is suppose that the most likely site of ionization will be from the nonbonding orbital of a heteroatom if it contais an heteroatom. But in case of molecule without hetero atom (ie. molecule with only sigma and pi bonds) it is easier to ionize pi bond (electron from p-orbital rather than from a s-bond orbital) through carbon-carbon bonds because pi bonds are less stable (ie. already higher in energy) than sigma bonds.

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