Hey everyone. So in this example question, it says, select a true statement that best describes crystalline polymers. So here it says, higher density polymers are softer than amorphous polymers. Right. So here, if we have higher density, this would lead to higher rigidity, higher strength, so they shouldn't be softer.

Higher degree of crystallinity leads to decreased polymer brittleness. Alright. So here we're saying high degrees of crystalline leads to decreased polymer brittleness. Right. So here, we never mentioned this idea of crystallinity and brittleness.

We have higher crystallinity that leads to higher density, which means we're going to have higher rigidity and higher strength of that given polymer. High degree of branching introduces regions of highly ordered chains. No. If we have more branching, there's the greater chance of more disorder, more amorphous regions being created. These are disordered arrangements.

Crystalline regions are more rigid than amorphous regions in a polymer. That's true. There's more organization, there's more ordered arrangements for a crystalline region than an amorphous region, this leads to greater rigidity. Right? So here, out of all the statements, only option d is true.