Which m/z value(s) most likely indicates an alkyl chloride?

Question

Quizplus · Accepted Answer

EAlkyl chlorides exhibit a characteristic isotopic pattern due to the presence of chlorine isotopes ^35Cl and ^37Cl. The M peak corresponds to the molecule containing ^35Cl, and there is a peak at M+2 (2 mass units higher) due to the presence of ^37Cl. The intensity ratio of these peaks often reflects the natural abundance of the chlorine isotopes, with ^35Cl being approximately three times as abundant as ^37Cl, which is consistent with choice D. Choice E also indicates the presence of a halogen with two isotopes of roughly equal abundance, which could suggest the presence of chlorine, although the equal intensity might more closely suggest bromine; however, in the context of the options provided and without a more specific indication of bromine, E could also be considered correct for an alkyl chloride with a different isotopic pattern or in a mixture.

Which M/z Value(s) Most Likely Indicates an Alkyl Chloride