A student decides to graph bp vs. molecular weight. This graph is shown below, on the le...

A student decides to graph bp vs. molecular weight. This graph is shown below, on the left.

a. What boiling point trends are highlighted by this graph?

b. The alkyl bromide (R-Br) line seems out of place to this student. She feels the alkane line (R-CH₃) should be farthest to the right. Construct an explanation for why she thinks this.

c. She brings her graph to her professor. The professor suggests that she make a new graph with a different property plotted on the x axis. When the student does this, the graph comes out as she expected. What molecular property is plotted along the x axis of this new graph? (Shown below, right.)