3-6 I dont not know how to do. The absence of an M+2 peak with relative abundanc

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3-6 I dont not know how to do.

The absence of an M+2 peak with relative abundance > 1 indicates that certain elements cannot be present. Which elements cannot be present? Chlorine Bromine sulfur Explain why these elements cannot be present. Consider the following questions in order to complete the molecular formula for these constitutional isomers. Can these isomers be hydrocarbons? Why or why not? If not, what other element is likely to be present? What is the molecular formula for these isomers? What is the index of unsaturation for this molecular formula? Seven constitutional isomers share this molecular formula. Draw the seven constitutional isomers. Identify the molecular class and functional groups. Name all seven constitutional isomers. Two isomers show their base peak at m/z=45. What mass was lost from the molecular ion to create a daughter ion at m/z=45? What molecular fragment was lost as a radical? Which isomers can undergo alpha-cieavage to produce a peak at m/z=45? Draw the alpha -cleavage mechanism for one of these two isomers.

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