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Which polymer gives dark brown precipitate when its pyridine solution is heated in the presence of alcoholic NaOH solution?

Which polymer gives dark brown precipitate when its pyridine solution is heated in the presence of alcoholic NaOH solution? Correct Answer polyvinyl chloride

When pyridine solution of polyvinyl chloride is heated in the presence of few drops of alcoholic NaOH solution, eventually dark brown precipitate is obtained.

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