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Mass Spectrum of Compound, Find MR Question

How to interpret mass spectrum of compound and determine mr:
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Based on this question the mr is 56,but why is not 42 since it has the largest abundance
(edited 2 years ago)
Reply 1
56, the small peak at 57 is due to the presence of 13C isotope in the carbon atom. Electro-spray means molecule is likely to be intact so just go for the highest m/z ratio for molecular ion peak.

try here for more help https://www.science-revision.co.uk/A-level_mass_specrometer_TOF.html

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