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Pyridine and DCM (Dichloromethane) have different properties and applications in extraction. Pyridine is a polar, basic solvent often used for reactions involving nucleophiles. DCM is a non-polar, aprotic solvent commonly used for extractions due to its low boiling point, good solubility for organic compounds, and immiscibility with water. The choice of solvent depends on the specific compounds being extracted and the reaction conditions.