Answers
In Diels-Alder Reaction a dienophile in some which in electron defficient species. Greater the electron widrawing group atlas to alkene higher it's dienophilicity. Hache 4 In 3 & 4th ewd group attached to alkene hence it would be most dienophile. In 1&2 , halogens are attached & we know that it has greater -I effect than -Br hence I made it more electron defficient than Br.
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Result is that and would be mose dienophile thom est one. Hence ist dienoplile is slowest in diell-Elder reaction because Ist one is slightly election siclo than other. option is correct.
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