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List-I(Preparation of polymer)
List-II (Mechanism involved)
I) Novolac from phenol and $H C H O / H^{+}$ P) Step growth polymerization
II) PHBV from its monomers Q) Aromatic electrophilic substitution
III) LDPE from ethene at 1000-2000atm, 350-570k, in the presence of traces $O_{2}$ R) Free radical addition
IV) Melamine – formaldehyde resin from its monomers S) Nucleophilic acylsubstitution
T) Nucleophilic addition
The correct match is

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I – PQ; II – PS; III – R; IV – PT

I – PT; II – PS; III – R; IV – PQ

I – PQ; II – PT; III – R; IV – PT

I – Q; II – S; III – PR; IV – T

answer is C.

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