12:32 PM iPad 7% pages.towson.edu Spectroscopy Probl... Fall14SPECT2Tue... Fall

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12:32 PM iPad 7% pages.towson.edu Spectroscopy Probl... Fall14SPECT2Tue... Fall 14LidocaineBPre... Expt 5A Lidocaine Expt3BLidocaineBF... Name: SPECT 2: Proton NMR HMWK Lab Section: T The molecular formula for an unknown Compound Q is C4H8O. Evaluate the IR shown below and determine the functional group present in the molecule: LOD 4000 150a 2000 L000 HAVENUMBERI I In the table below list the chemical shift, calculated integration value, splitting pattern and the molecular fragment for each of the signals seen on the proton NMR shown below, then based on the information provided, assemble the structure of unknown Compound Q. Show all required work, to obtain full credit. 0.24 0.24 0.12 0.36 10 PPM Splitting Pattern Molecular Fragment Chemical Shift Integration

Explanation / Answer

from IR spectra , 1720/cm indicates the presence of aldehyde functional group

2900-3000/cm indicates C-H strech in alkanes.

from NMR SPECTRA

chemical Integra splitting molecular fragment

shift value - -tion pattern

0.6 - 3H - triplet ( CH3-CH2- ) ( According to n+1 rule)

1.8 - 2H sextet ( CH3-CH2-CH2-

2.4 - 2H quartet ( CH2-CH2-CHO)

10 - 1H singlet - ( - CHO GROUP)

THE COMPOUND IS CH3-CH2-CH2-CHO (BUTANAL)

  

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