The most correct product for the given reaction is Ethanoic acid
Option A is
correct
The reaction shown is a Diels-Alder reaction, which is a type of cycloaddition reaction between a diene and a dienophile. In the given reaction, the diene is 1,3-butadiene and the dienophile is ethylene.
The Diels-Alder reaction is a concerted reaction, meaning that all of the bond-breaking and bond-forming steps occur simultaneously. The product of the reaction is a cyclohexene derivative with the two substituents from the diene and dienophile attached to opposite carbons.
In the given reaction, the product is ethanoic acid which the molecule is formed by the addition of a hydrogen atom from the ethylene molecule to the carbon atom of the butadiene molecule that is attached to the two methyl groups.