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  4. The Novolac polymer has mass of 963 g. The number of monomer units present in it are

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Q. The Novolac polymer has mass of $963\, g$. The number of monomer units present in it are

JEE MainJEE Main 2022Polymers

Solution:

Monomer unit of Novolac is
image
its
molecular mass is $124$ amu. Upon considering molecular weight of polymer as $963$ amu (In question its given as $963$ gram) Now if during formation of Novolac, $(n-1)$ unit of water are removed then
$n \times 124=963+[18 \times( n -1)]$
$n =9$