Question

If the alpha carbon atom bonded to sp2 will it show tautomerism

Answer 1

Answer:

Yes, it certainly can. The clearest examples are αα,ββ-unsaturated carbonyl compounds like crotonaldehyde.

But Greek letters are just a way of numbering chains. In crotonaldehyde, the αα carbon is the first carbon of “the chain attached to the carbonyl group.”

You can also have Greek lettering used in an all-carbon chain; the most common example of a class of compounds in which the αα carbon is sp2sp2 is the class of “αα-olefins,” which is an old-style way of naming the set of “1-alkenes.”

Answer 2

Explanation:

alpha-hydrogen atom and keto-enol tautomerism. For an aldehyde or a ketone to exhibit keto-enol tautomerism, it is essential that it must have atleast one α-hydrogen atom. Thus, acetophenone, butan-2-one and propionaldehyde all contain α- hydrogen atoms and hence show keto-enol tautomerism.