To deduce the structure of the unknown compound, we need to analyze the H1 NMR spectrum data. The number of peaks, their chemical shift values, and their integration values provide us with important information about the molecule's structure.
Assuming the H1 NMR spectrum has four peaks, and using the chemical shift values and integration values, we can conclude that the compound has the following H atoms:
Two H atoms that appear as a singlet at around 1.9 ppm (integration value 3)
Two H atoms that appear as a doublet at around 4.1 ppm (integration value 1)
Based on these observations, we can conclude that the compound has a branched structure with a methyl group (CH3) and a methylene group (CH2) attached to a carbonyl group (C=O).
One possible structure that fits the data is 2-methylpropanal, which has the following structure:
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CH3
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CH3-CH-CHO
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H
In this structure, the two H atoms that appear as a singlet correspond to the methyl group (CH3), while the two H atoms that appear as a doublet correspond to the methylene group (CH2) adjacent to the carbonyl group (C=O).
Note that there may be other possible structures that fit the data as well, but this is one example.