What distinguishes the mass spectrum of 2,2-dimethylpropane from the mass spectra of pentane and isopentane?

Mass spectrum is plot in which y-axis is taken as intensity and x-axis is taken as m/z also known as mass to charge ratio in order to analyse a compound.

The mass to charge ratio depends upon the molecular mass of a compound or the corresponding cation fragments while, the intensity mainly depends upon the stability and concentration (natural abundance) of atoms / ions respectively.

In said problem we can distinguish 2,2-dimethylpropane from Pentane and Isopentane by different ways using mass spectrum. As shown in attached picture all of the given compounds give a same m/z value of 57. As the carbocation formed by 2,2-dimethylpropane is tertiary so its intensity will be greater because this cation is more stable. Therefore, the peak m/z = 57 for Pentane (primary carbocation) and Isopentane (secondary carbocation) will be having less intensity than 2,2-dimethylpentane.

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.

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