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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

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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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