[ajax0604]

In my chemistry textbook, the following data is given for the mp and bp respectively:
2,3-dimethylbutane    -129      58
2,2-dimethylbutane     -100      50

Even though the textbook discusses why linear/symmetrical molecules have higher mp/bp, it doesn't address why 2,3-dimethylbutane has a higher bp but lower mp compared to 2,2-dimethylbutane. I can't seem to find a clear answer to this anomaly online.

Thank you for your help.

[Babcock_Hall]

My present general impression is that boiling point trends are a little easier to understand than melting point trends.  Why don't you provide your thinking as a starting point, so that we can discuss that?