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Diels - Alder reaction will not take pla...

Diels - Alder reaction will not take place with which of the following reactants?

A

B

C

D

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The correct Answer is:
A
Diel-Alder reaction is the reaction between conjugated dienes (compounds containing alternate double bonds) and alkenes to form cycloalkenes. Diels-Alder reaction will not take place with and || since, it is not a conjugated alkene.
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