Formaldehyde is not present as a monomer in:

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(C) Formaldehyde $(HCHO)$ is a common monomer used in the preparation of condensation polymers like Bakelite,Novolac,and Melamine resin. $1$. Bakelite

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Orlon

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(C) Formaldehyde $(HCHO)$ is a common monomer used in the preparation of condensation polymers like Bakelite,Novolac,and Melamine resin. $1$. Bakelite and Novolac are formed by the condensation reaction of phenol and formaldehyde. $2$. Melamine resin is formed by the condensation reaction of melamine and formaldehyde. $3$. Orlon (also known as polyacrylonitrile) is an addition polymer formed by the polymerization of acrylonitrile $(CH_2=CH-CN)$. Therefore,formaldehyde is not a monomer in the formation of Orlon.

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