Section No. Your Name INFRARED SPECTROSCOPY PROBLEMS: (Total Points- 20, due at

Question

Section No. Your Name INFRARED SPECTROSCOPY PROBLEMS: (Total Points- 20, due at the beginning of elass next week). 1) How could the pair of structures shown be distinguished using IR spectroscopy? List the diagnostic peaks in maxe mambsns that would be present or absent for each pair. (4 points) 2) The IR spectrum below is of one of the compounds shown. Cirele structure that corresponds to the spectrum and label the peaks you used to make your choice. (2 points) 1-Phenylnonane 2,2-dimethylheptane Ethyl acetate 2-methyl-1-hexene 1000 500 4000 3000 2000 1500 Wavenumber (cm-1)

Explanation / Answer

1)

a

first is an example of secondary amine while second is a primary amine.

PRIMARY AMINES- give two short pointed absorbances in 3100-3600cm-1 du eto The TWO N-H bonds

SECONDARY AMINES- give only one N-H bond in this region.

First structure has cyclic alkane while second structure is long chain alkane which give C–H rock, methyl, from 725-720 cm-1

b.

First structure is an ether; -O- while second is an aldehyde, >C=O.

Aldehyde give a strong peak in region 1670-1820cm-1 due to C=O stretch

While ether give 1070-1150 cm-1 due to C-O stretch

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