Answer:
A) Three pi bonds break; two sigma bonds and one pi bond form.
Explanation:
Diels Alder reaction -
It is one of the chemical reaction , where the reaction of a substituted alkene and a conjugated diene takes place , is referred to as the diel alder reaction .
Where the substituted alkene is referred to as the dienophile .
Hence , it is also known as diene - dienophile reaction.
The mechanism followed by the reaction is same as for pericyclic reaction , in this reaction , there is breakage of three pi bond and the formation of one pi an two sigma bond.
