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Powerful electron-withdrawing group (cyano) on the electron-deficient dienophile decrease the energy barrier for the cycloaddition and decrease the stability of the product whiles weak electron-withdrawing (bromine and chlorine) and electron-donating groups increase the energy barrier for the cycloaddition and decrease the stability of the product. The hydroquinone as an activator decreases the activation barrier for the Diels-Alder cycloaddition reaction.High salt concentrations in the growing medium can severely affect the growth an