The acrylic polymer must contain :

acrylonitrile monomer.

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sodium thiocyanate.

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acrylic acid.

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sulphuric acid.

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Solution

The correct option is A acrylonitrile monomer.
Acrylic fibers are synthetic fibers made from a polymer (polyacrylonitrile) with an average molecular weight of approx 100,000, about 1900 monomer units.

For a fiber to be called acrylic, the polymer must contain at least 85% acrylonitrile monomer. Acrylonitrile is an organic compound that is a colorless volatile liquid.

So, the correct option is $A$

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