Homework Answers
Most reactive dienophile in diels alder reaction is the one having electron withdrawing groups as they decrease energy of dienophile orbitals.
In I , one NO2 ( electron withdrawing group) is there
In II, one COOCH3 (electron withdrawing group) is there
In III, two COOCH3 (electron withdrawing group) are there
In IV, one CH3 (electron releasing group) is there
More are electron withdrawing groups on dienophile, higher is its reactivity. So answer is C option III.
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