Discussion
The molecular ion peak in a mass spectrum gives the compound's
Answer: D
Correct answer: molecular mass
The molecular ion is the intact molecule minus one electron, so its mass-to-charge ratio gives the molecular mass directly. High resolution instruments measure it precisely enough to distinguish formulae of the same nominal mass and so give the molecular formula. It says nothing about boiling point, and the number of double bonds follows only after the formula is known, from the degrees of unsaturation.
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