שאלה | Of the following statements on polymer molecular parameters affecting chain flexibility and thus Tg which one is not correct: (Choose from the following four possibilities)

Of the following statements on polymer molecular parameters affecting chain flexibility and thus Tg which one is not correct: (Choose from the following four possibilities)

		Chain flexibility is mainly determined by the flexibility of the main chain.
		Chain flexibility is not only determined by the groups present in the main chain-the side groups can also be important because of steric and secondary interactions.
		Since segment motion implies the concerted movement of many chain atoms and bulky 7 side chains which hinder rotation about the single bonds increase Tg.
		It is expected that that polymers with high polarity or high cohesive energy density willhave a lower Tg than nonpolar polymers.