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(A) Nylon $6,6$ is made by using step growth polymerization (also known as condensation polymerization).In step growth polymerization,bifunctional or

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Nylon $6,6$

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(A) Nylon $6,6$ is made by using step growth polymerization (also known as condensation polymerization).In step growth polymerization,bifunctional or multifunctional monomers react to form dimers,which then react to form longer chain polymers.Specifically,for Nylon $6,6$,hexamethylene diamine $(H_2N(CH_2)_6NH_2)$ and adipic acid $(HOOC(CH_2)_4COOH)$ react with each other to form a dimer,which then polymerizes into long chains with the elimination of water molecules.

Column $-I$	Column $-II$
$A$. Nylon $-6, 6$	$i$. Free radical polymerisation
$B$. $PVC$	$ii$. Ziegler-Natta polymerization or coordination polymerization
$C$. $HDP$	$iii$. Anionic polymerisation
	$iv$. Condensation polymerization

Which one of the following is made by using step growth polymerization?

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