A strip of filter paper dissolved in ethereal solution containing p-dimethylamino benzaldehyde and hydroquinone and then moistened with a 30% solution of trichloroacetic acid in isopropanol produces blue-violet colour in the presence of pyrolytic vapours of rubbers A and B. Which of the following pair represent rubbers A and B?

styrene butadiene rubber and silicone rubber

natural rubber and butyl rubber

styrene butadiene rubber and silicone rubber

styrene butadiene rubber and natural rubber

natural rubber and nitrile butadiene rubber

A strip of filter paper dissolved in ethereal solution containing p-d

1.	A strip of filter paper dissolved in ethereal solution containing p-dimethylamino benzaldehyde and hydroquinone and then moistened with a 30% solution of trichloroacetic acid in isopropanol produces blue-violet colour in the presence of pyrolytic vapours of rubbers A and B. Which of the following pair represent rubbers A and B?
A.	natural rubber and butyl rubber
B.	styrene butadiene rubber and silicone rubber
C.	styrene butadiene rubber and natural rubber
D.	natural rubber and nitrile butadiene rubber
Answer» B. styrene butadiene rubber and silicone rubber

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A strip of filter paper dissolved in ethereal solution containing p-dimethylamino benzaldehyde and hydroquinone and then moistened with a 30% solution of trichloroacetic acid in isopropanol produces blue-violet colour in the presence of pyrolytic vapours of rubbers A and B. Which of the following pair represent rubbers A and B?

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