For each of the following pairs of polymers, state whether it is possible to determine whether one has a higher melting temperature than the other.

A$.$ Isotactic polystyrene with p $=1\mathrm{.}12$ g$/$cm$3$ and Mw $=150,000$ g$/$mol;

syndiotactic polystyrene with p $=1\mathrm{.}10$ g$/$cm$3$ and Mw $=125,000$ g$/$mol

B$.$ Linear polyethylene with DP $=5,000$; linear and isotactic polypropylene

with DP $=6,500$

C$.$ Branched and isotactic polystyrene with DP $=4,000$; linear and isotactic

polypropylene with DP $=7,500.$