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What colour change is observed when few drops of alcoholic NaOH is added to polyvinyl chloride solution?

What colour change is observed when few drops of alcoholic NaOH is added to polyvinyl chloride solution? Correct Answer colourless to yellow

When few drops of alcoholic NaOH is added to the solution of polyvinyl chloride then the mixture changes from colourless to yellow, yellow-brown, dark-brown to black with time.

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