Solution
C
3
H
7
NO
2
Basic considerations
Double bond equivalents,
number of signal groups,
chemical shifts
We don’t know about the oxidation number of nitrogen. Therefore, one
cannot determine the number of double bond equivalents beyond doubt.
We observe three signal groups at approx. 4.4 ppm, 2.1 ppm and 1.0
ppm. A more precise indication of the chemical shift is not necessary
here.