In this example question, it says, 2 polymers are being studied in a lab. Polymer A has a highly ordered region and strong intermolecular forces, while Polymer B has an amorphous region or amorphous structure and weak intermolecular forces. Explain why Polymer A has a higher \( T_g \) and \( T_m \) than Polymer B. Right. So here it says, Polymer A has higher \( T_g \) and \( T_m \) because crystalline structures are more flexible than amorphous.

No. They're not more flexible. They're less flexible because if your crystalline structure is more ordered, you're going to become more rigid. Strong intermolecular forces and higher degrees of crystallinity in Polymer A restrict chain movement resulting in higher \( T_g \) and \( T_m \). That's true.

So we'll say that this is the answer for now. Higher \( T_g \) and \( T_m \) cause polymers to develop stronger intermolecular forces. No. That's not what's going on. It's the stronger forces, the stronger more ordered structure that leads to higher \( T_g \) and \( T_m \).

Crystalline polymers allow for more movement along the chain resulting in higher \( T_g \) and \( T_m \). No. They don't allow for higher movement. They result in lower or less movement and that leads to higher \( T_g \) and \( T_m \). So out of all our options, only option B is a correct statement.

So if you're here, we'd say B would be our final answer.