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- Rank the following dienes in order of increasing reactivity in a Diels–Alder reaction.Rank the following dienes from most reactive to least reactive in a Diels–Alder reaction:Exp3: Diels-Alder reaction Why does cyclopentadiene regularly form a dimer? How to break the dimer into monomers? Does the diene in this reaction act as the nucleophile or the electrophile? Is the maleic anhydride a nucleophile or an electrophile in this reaction? Explain your reasoning.