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.

Answer: (a) all bond making and bond breaking occurs simultaneously.

Explanation: In a concerted reaction like the Diels-Alder reaction, all the bond-making and bond-breaking processes occur in a single step without any intermediates. This is characteristic of pericyclic reactions, where the transition state is cyclic and involves a simultaneous reorganization of electrons.

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