The COSY NMR spectrum of 2-methyl-3-pentanone is shown below. Draw the structure of 2-methyl-3-pentanone and number the proton environments sequentially Cut and paste the COSY spectrum or download the image and save it as a picture file Label each signal in the COSY spectrum according to which proton environment it relates to in the structure of the molecule.

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Q: C b ease click here if image does not display. d a b DC ( H H3C CH-CH3

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Q: OH OH

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Q: 18. Which signal below corresponds to the protons indicated? | Ci CH H3C (a) (b) CH3 (c) (d)

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Analyzing and Predicting Spectroscopic Data

The interaction of electromagnetic radiation with the structure of molecules in the sample and their study is referred spectroscopy. Several spectroscopic methods are used to acquire sample information, and these methods are proved to be accurate, fast, and non-destructive. The information obtained about the content and composition of molecules from these spectroscopic methods is called spectroscopic data.