A compound has a mass spectrum that shows a 3:1 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 belowNone of the choices are correct.CH3CH2CH2OCH2CH2CH2Cl
Question
A compound has a mass spectrum that shows a 3:1 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 belowNone of the choices are correct.CH3CH2CH2OCH2CH2CH2Cl
Solution
The compound that is consistent with the given mass spectrum data is CH3CH2CH2OCH2CH2CH2Cl.
Here's why:
The M+ peak represents the molecular ion (original molecule). The M+2 peak represents the molecular ion with an additional two units of mass. This is typically due to the presence of a heavier isotope.
In this case, the 3:1 ratio of the M+ peak to the M+2 peak suggests the presence of chlorine (Cl) in the molecule. This is because chlorine has two naturally occurring isotopes, 35Cl and 37Cl, in approximately a 3:1 ratio.
Therefore, the compound CH3CH2CH2OCH2CH2CH2Cl, which contains a chlorine atom, is consistent with the given mass spectrum data.
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