Cyclohexene: spot the wrong reaction class

Single question

One step: butadiene plus ethylene to cyclohexene. Atoms balance, reagents are right. Read the reaction class label.

Diels-Alder [4+2] cycloaddition

Pericyclic vs cationic reaction families

Distinguishing Friedel-Crafts from concerted cycloaddition

Click the step that contains the flaw, or pick “No flaw” if you think every step is correct.

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