Final answer:
The (4 + 2) cyclo addition reaction forms a 6-membered ring and involves the loss of two atoms. It does not yield a racemic mixture.
Step-by-step explanation:
The (4 + 2) cyclo addition reaction forms a 6-membered ring. This reaction involves the loss of two atoms. It does not yield a racemic mixture, as the stereochemistry of the product is determined by the starting materials and reaction conditions.