NMR spectrum of compound A:
NMR: The NMR spectrum provides two important bits of information as given below.
i)A single signal indicates that only one type of protons is present in the molecule that is, all the protons are equivalent.
ii) The chemical shift of δ = 2.2 denotes in which the protons are slightly deshielded; may be due to being in the neighbourhood of an anisotropic group (>C = O)
Figure: 1H-NMR spectrum of compound A