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A compound has a mass spectrum that shows a 1:1 height ratio of its (M)+• peak at m/z = 122 and its (M+2)+• peak at m/z = 124. Which of the compounds below is consistent with this data?Select answer from the options belowNone of the choices are correct.CH3CH2OCH2CH2CH2Cl

Question

A compound has a mass spectrum that shows a 1:1 height ratio of its (M)+• peak at m/z = 122 and its (M+2)+• peak at m/z = 124. Which of the compounds below is consistent with this data?Select answer from the options belowNone of the choices are correct.CH3CH2OCH2CH2CH2Cl

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Solution

The compound that is consistent with this data is CH3CH2OCH2CH2CH2Cl.

Here's why:

The 1:1 height ratio of the (M)+• peak at m/z = 122 and its (M+2)+• peak at m/z = 124 indicates 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, the presence of chlorine is indicated by a 1:1 ratio of the (M)+• and (M+2)+• peaks due to the way the mass spectrometer ionizes the sample.

The molecular weight of CH3CH2OCH2CH2CH2Cl is 122.5 g/mol, which is consistent with the (M)+• peak at m/z = 122. Therefore, this compound is the one that is consistent with the given mass spectrum data.

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