Which of the following is the most reactive dienophile towards buta-1,3-diene in a Diels-Alder reaction?

AEthene (ethylene)
BPropene
CProp-2-enal ( $CH X_{2} = CH - CHO$ )
D2-Methylpropene

Answer: C

Normal-demand Diels-Alder reactions are fastest with electron-poor dienophiles. The aldehyde group in prop-2-enal lowers the LUMO energy. Alkyl groups on ethene are electron donating and slow the reaction.

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