Which of the following rubbers turn the filter paper in ethereal solution containing p-dimethylamino benzaldehyde and hydroquinone and then moistened with a 30% solution of trichloroacetic acid in isopropanol grey with a yellow tinge?

Which of the following rubbers turn the filter paper in ethereal solu

1.	Which of the following rubbers turn the filter paper in ethereal solution containing p-dimethylamino benzaldehyde and hydroquinone and then moistened with a 30% solution of trichloroacetic acid in isopropanol grey with a yellow tinge?
A.	natural rubber
B.	silicones
C.	polychloroprenes
D.	butyl rubbers
Answer» D. butyl rubbers

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Which of the following rubbers turn the filter paper in ethereal solution containing p-dimethylamino benzaldehyde and hydroquinone and then moistened with a 30% solution of trichloroacetic acid in isopropanol grey with a yellow tinge?

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