Exercises: Regioselectivity in Second ArS_E

Exercise

Through an electron-withdrawing first substituent, ortho and para substitution are considerably retarded, while the meta substitution's reaction rate is not considerably affected. Therefore, in the presence of an electron-withdrawing first substituent, ...

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	... ortho substitution predominates.
	... meta substitution predominates.
	... para substitution predominates.

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Exercise

First substituents with +M effect enable an additional resonance structure of the σ complexes ...

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	... in ortho and meta substitution, but not in para substitution.
	... in meta and para substitution, but not in ortho substitution.
	... in ortho and para substitution, but not in meta substitution.

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