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# Orlon has a unit of

$\begin {array} {1 1} (a)\;vinyl\: cynide & \quad (b)\;acrolein \\ (c)\;glycol & \quad (d)\;isoprene \end {array}$

Orlon is a synthetic polymer made from vinyl cynide Acrylic fibers are synthetic fibers made from a polymer (polyacrylonitrile) with an average molecular weight of ~100,000, about 1900 monomer units. To be called acrylic in the U.S, the polymer must contain at least 85% acrylonitrile monomer. Typical comonomers arevinyl acetate or methyl acrylate. DuPont created the first acrylic fibers in 1941 and trademarked them under the name Orlon. Acrylic is also called acrilan fabric as it resembles silk.
Ans : (a)