How can I distinguish between the following isomers by IR s

: How can I distinguish between the following isomers, by IR spectroscopy? Be reply 2. What is the name of the instrument that is used in the infrared analysis of an organic compound? Briefly explain how the instrument works. 3. Mention two ways to prepare a sample to run you a spectrum of infrared. 4. Mention two aspects that differ the techniques of IR and NMR. Differentiate between the information provided by the multiplicity of a signal (if Singlet, doublet, triplet, etc.) and the area under this. s. tu ectrum, listratd boloe 6. P C7HyS 7. Draw the expected spectrum NMR for the compound Ci2CHCH20CH3 Ppm

Solution

1. The carbonyl C=O bond stretch for both aliphatic ketone and carboxylic acid are very close, they show strong peak 1725-1705 cm^-1 and 1720-1706 cm^-1 respectively. However, the OH stretch for alcohol is 3550-3200 cm^-1, while that for carboxylic acid is 3300-2500 cm^-1 usually centered on 3000 cm^-1, which can be used to distinguish between the two structures.