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Q. is a repeating unit for :
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JEE MainJEE Main 2021Polymers

Solution:

Phenol $+H-\overset{\underset{||}{O}}{C}-H \xrightarrow{H^+} \underset{\text { (Given stucture) Linear polymer }} {\text { Novalac }} \xrightarrow{{\text { Polymerisation }}}\underset{(\text { 3D structures })}{\text { Bakelite }}$