Unformatted text preview: hat six hydrogen atoms are attached to the adjacent molecule(s)
that exhibit spin-spin coupling. (2 points; NOTE: students don’t need to use the term
2. (60 points) This problem concerns the IR and NMR spectra of simple compounds.
spin-spin coupling – they may use splitting or discuss neighboring atoms.) Ch 1b Final Exam SOLUTIONS a) Diisopropyl ether You are told that the proton NMR spectrum of an unknown material shows two groups of peaks. The first group (a doublet) has six times
the area of the second group (a septet). You are told that the molecular formula for the unknown material is C6H14O. Draw your proposed
satisfies these of the unknown material. Briefly explain your answer.
structure three criteria. (2 points for structure) (10 points)
Since there are two groups of peaks, there are only two types of hydrogen atoms. (5 points) We’ll call them types α and β. Since the peak area is 6:1 and there are 14 total hydrogen atoms in the molecule, there must be 12 hydrogen atoms of type α and two hydrogen atoms of type β. (5 points) The first group (type...
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