Question

Hi this is the NMR and IR for the same unknown liquid compound. Please help me interpret the NMR and identify compound.

Answer 1

The compound could be butyraldehyde CH₃-CH₂-CH₂-CHO

How:

1) From IR data : 1729cm^-1 indicate the CO str

2) 1H NMR: around 9.9ppm also confirmed the presence of Aldehyde

3) From 1H NMR, we can assume that there are 4 type of protons. one already we confirmed the presence of CHO-aldehyde group.

4) Remaining peaks are in the alkyl region, that is low field region. integration, 2, 2, 3 indicate the presence of CH2-CH2-CH3.

5) May be spliting pattern is not clearly visible.

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