In the compound's 13c nmr spectrum, there should be six signals. Despite there being four carbon atoms, there are only three distinct habitats for the carbons in the spectrum, which has a total of three peaks.
The carbon skeleton itself, not simply the proton linked to it, is the subject of the 13C NMR. The quantity of signals indicates the number of distinct carbons or sets of comparable carbons. b. Signal splitting reveals how many hydrogen atoms are bonded to each carbon. Due to sp2 hybridization and the double bond to oxygen, the 13C-NMR signals for carbonyl carbons are often the deepest downfield (170–220 ppm).
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