Give the decreasing order of reactivity of Diels-Alder reactions for the following :

(I) > (II) > (III) > (IV)

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(IV) > (III) > (II) > (I)

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(IV) > (III) > (I) > (II)

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(II) > (I) > (III) > (IV)

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Solution

The correct option is D (IV) > (III) > (II) > (I)
The decreasing order of reactivity of Diels-Alder reactions is $(I V) > (I I I) > (I I) > (I)$ .

The Diels-Alder reaction proceeds faster when dienophiles have electron-withdrawing groups and dienes have an electron-donating group.

Hence, the correct option is B.

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