Org Chem (II) (1) Conjugated System

Which of the following is NOT a conjugated system?

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Which of the following two compounds are the major 1,2 and 1,4 adducts by reacting this diene with one equivalent of HBr?

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Which of the following compounds are the products from the Diels-Alder reaction between these two reactants?

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Which of the following compounds are the endo addition products from the Diels-Alder reaction between these two reactants?

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Which of the following alkenes would you expect to be good Diels-Alder dienophlies?

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The Diels-Alder reaction is sometimes reversible and the backward reaction is called a retro-Diels–Alder reaction. Which of the following compounds can be potential products of the retro-Diels–Alder reaction for the compound shown?

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