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Pyridines substituted with leaving groups at the 2- or 4-position readily undergo nucleophilic aromatic substitutions. Provide a mechanism for the following reaction and explain why

Pyridines substituted with leaving groups at the 2- or 4-position readily undergo nucleophilic aromatic substitutions. Provide a mechanism for the following reaction and explain why such substitutions do not take place at the 3-position. (5 marks)

CI SCH3 NaSCH3 N' N.

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