Which compound will show an intense peak in the mass spectrum at m/z 58?

Name: Which compound will show an intense peak in the mass spectrum at m/z 58?
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Question

Quizplus · Accepted Answer

The compound in choice A is butane (C4H10), which can fragment to give a butyl cation with a mass-to-charge ratio (m/z) of 57. However, due to the presence of a small amount of C-13 isotopes in natural carbon, a peak at m/z 58 would also be observed, corresponding to the butyl cation containing one C-13 atom.

Which Compound Will Show an Intense Peak in the Mass