Discussion
Assertion: a strong molecular ion peak proves a compound's molecular mass. Reason: the molecular ion forms by loss of one electron without fragmentation.
Answer: D
Correct answer: both the assertion and the reason are true and the reason explains the assertion
Both are true and the reason accounts for the assertion. The molecular ion is formed by removing a single electron, whose mass is negligible, so the ion retains the whole molecule and its mass-to-charge ratio gives the molecular mass. The caution implicit here is that the peak must be identified as the molecular ion: in many compounds it fragments so readily that it is weak or missing, and a fragment mistaken for it would give the wrong answer.
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