Here I attach here a CBSE class 12 chemistry doubts of polymer chapter. In the book a condensation reaction takes place between p-hydroxymethylphenol with phenol derivative to form polymer Novolac with CH2 linkage.
I think linkage unit is OCH2
It is the CH2 linkage. Please see the attached picture for the synthesis mechanism.
thank you Tianyu Liu
organic chemist
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