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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?

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? Correct Answer polyacryonitrile

Pyrolytic vapours of polyacrylonitrile respond to this test and develop bright blue colouration.

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