A peak on a mass spectrum of an organic compound with an odd mass-to-charge ratio is indicative of a molecule with an odd number of nitrogens.

Name: A peak on a mass spectrum of an organic compound with an odd mass-to-charge ratio is indicative of a molecule with an odd number of nitrogens.
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Quizplus · Accepted Answer

This is because nitrogen has an odd atomic mass number, and so an odd number of nitrogens in a molecule will result in an odd overall mass-to-charge ratio on the mass spectrum.

A Peak on a Mass Spectrum of an Organic Compound