Which of the following rubbers when treated with trichloroacetic acid give pink-mauve melt and on dilution give grey-mauve precipitate?

Which of the following rubbers when treated with trichloroacetic acid

1.	Which of the following rubbers when treated with trichloroacetic acid give pink-mauve melt and on dilution give grey-mauve precipitate?
A.	isomerized rubber
B.	acetone-extracted NR
C.	gutta percha
D.	all of the mentioned
Answer» E.

Discussion

No Comment Found

Related MCQs

Which of the following polymer will not give grey colour when their pyrolytic vapours are tested with a strip of filter paper soaked in saturated solution of o- nitrobenzaldehyde in dilute NaOH?
What colour is obtained when a strip of filter paper soaked in saturated solution of o-nitrobenzaldehyde in dilute NaOH is held over the prylotic vapours of Nylon 6,6?
A strip of cupric acid paper, freshly moistened with a dilute solution of benzidine in dilute acetic acid is held in the pyrolytic vapours of polymer A and a bright blue colouration is obtained. Which of the following could be polymer A?
What colour is obtained if condensed pyrolyzate of polyacrylonitrile is made alkaline and boiled with ferrous sulphate followed by acidification?
The aqeous extracts of some polymers when tested with chomotropic solution followed by addition of sulphuric acid and then heating to nearly 100 C gave dark violet colour. Which of the following cannot respond to this test?
What colour is obtained when a drop of diphenylamine solution in concentrated sulphuric acid is added to the sample of cellulose nitrate in the absence of other oxidizing agents?
Which of the following do not respond to the Molisch test for carbohydrates?
What colour is obtained by the pyrolytic vapours of butyl rubber on the filter paper freshly soaked in a solution obtained by dissolving yellow mercuric oxide in conc. sulphuric acid and water on boiling?
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 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?

Which of the following rubbers when treated with trichloroacetic acid give pink-mauve melt and on dilution give grey-mauve precipitate?

Discussion

No Comment Found

Related MCQs

Reply to Comment