A compound has a mass spectrum that shows a 1:1 height ratio of its (M)+• peak at m/z = 136 and its (M+2)+• peak at m/z = 138. Which of the compounds below is consistent with this data?Select answer from the options belowCH3CH2CH2OCH2CH2CH2ClNone of the choices are correct.
Question
A compound has a mass spectrum that shows a 1:1 height ratio of its (M)+• peak at m/z = 136 and its (M+2)+• peak at m/z = 138. Which of the compounds below is consistent with this data?Select answer from the options belowCH3CH2CH2OCH2CH2CH2ClNone of the choices are correct.
Solution
The compound that is consistent with this data is CH3CH2CH2OCH2CH2CH2Cl.
Here's why:
The 1:1 height ratio of the (M)+• peak at m/z = 136 and its (M+2)+• peak at m/z = 138 suggests the presence of a chlorine atom in the compound. This is because chlorine has two isotopes, 35Cl and 37Cl, that occur in approximately a 3:1 ratio in nature. However, in a mass spectrum, this ratio is often seen as 1:1 due to the way the instrument works.
The molecular weight of the compound CH3CH2CH2OCH2CH2CH2Cl is 136.5 g/mol, which is consistent with the (M)+• peak at m/z = 136. The (M+2)+• peak at m/z = 138 would then correspond to the compound containing the 37Cl isotope instead of the 35Cl isotope.
Therefore, the compound CH3CH2CH2OCH2CH2CH2Cl is consistent with the given mass spectrum data.
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