Which of the following polymers has the highe | vedclass

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(D) The glass-transition temperature $(T_g)$ depends on the chain stiffness and the size of the side groups attached to the polymer backbone.$1$. Poly

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Polystyrene

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(D) The glass-transition temperature $(T_g)$ depends on the chain stiffness and the size of the side groups attached to the polymer backbone.$1$. Polyethylene $(T_g \approx -120 \ ^{\circ}C)$: Has a flexible backbone with no bulky side groups.$2$. Polypropylene $(T_g \approx -10 \ ^{\circ}C)$: Has a methyl group as a side chain,increasing stiffness compared to polyethylene.$3$. Polyvinyl chloride $(T_g \approx 80 \ ^{\circ}C)$: The polar chlorine atom increases intermolecular forces and chain stiffness.$4$. Polystyrene $(T_g \approx 100 \ ^{\circ}C)$: The bulky phenyl group significantly restricts the rotation of the polymer chain,leading to the highest $T_g$ among the given options.

Which of the following polymers has the highest glass-transition temperature $(T_g)$?

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