Which of the Following Statements Correctly Describes the Behavior of Heterocycles

question 50

Multiple Choice

Which of the following statements correctly describes the behavior of heterocycles in aromatic substitution reactions?

• A)Pyridine N-oxide is considerably more reactive toward electrophilic aromatic substitution reactions than pyridine because the oxygen atom can donate electrons into the ring by resonance.
• B)Pyridine N-oxide undergoes electrophilic aromatic substitution primarily at C-3.
• C)Pyridine is less reactive than benzene toward nucleophilic aromatic substitution.
• D)Nucleophilic aromatic substitution of pyridine takes place at C-3 because attack at this position leads to the most stable intermediate.
• E)none of the above

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