Q
QuestionBiochemistry

The Diels-Alder reaction is a concerted reaction; this means: (a) all bond making and bond breaking occurs simultaneously. (b) the reaction follows Markovnikov's rule. (c) the reaction is highly endothermic. (d) the products contain rings. (e) a mixture of endo and exo products are formed.
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Answer

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Step 1

TheDielsAlderreactionisaconcertedreaction,meaningthatallbondmakingandbondbreakingoccurssimultaneously.Thisimpliesthat(a)iscorrect.Concerted reaction: ad simultaneouslyThe Diels-Alder reaction is a concerted reaction, meaning that all bond making and bond breaking occurs simultaneously. This implies that (a) is correct. \text{Concerted reaction: } \quad a \rightarrow d \text{ simultaneously}

Step 2

Markovnikov's rule is related to the addition of H and X to an alkene, with the hydrogen adding to the carbon with fewer substituents. The Diels-Alder reaction does not involve such an addition, so (b) is not necessarily true for this reaction.

Final Answer

The Diels-Alder reaction is a concerted reaction that forms rings and can result in a mixture of endo and exo products.