The monomer of Novolac is:

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(C) Novolac is a linear polymer formed by the condensation polymerization of phenol and formaldehyde.In the initial step,the reaction between phenol a

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$o-$Hydroxymethylphenol

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(C) Novolac is a linear polymer formed by the condensation polymerization of phenol and formaldehyde.In the initial step,the reaction between phenol and formaldehyde yields a mixture of $o-$ and $p-$hydroxymethylphenol derivatives.These derivatives act as the monomers that undergo further condensation to form the linear polymer known as Novolac.Therefore,$o-$hydroxymethylphenol is the monomeric unit involved in the formation of Novolac.

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