Organic Chemistry Practice Problems Mass Spect: Isotopes Practice Problems Solution: Which structure best fits the Ms data below?

Solution: Which structure best fits the Ms data below?

Problem

Which structure best fits the Ms data below?


Solution

We’re being asked to determine the compound that produces the given mass spectrum.


The following information can be acquired from the mass spectrum:

– molecular ion (M+) peak: this gives us the approximate molecular weight of the compound. This is the peak with the largest m/z value.

– base peak: this gives us the most stable fragment of the compound. This is the peak with the largest relative abundance.


From the given mass spectrum, we can see that:

– M+ peak = 78 m/z

– M+2 peak = 80 m/z

– base peak = 43 m/z

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