Why are some rivers in Texas called “wrong way” rivers?
a.
The rivers run from the ocean.
b.
The rivers run from wet land to dry.
c.
The rivers run from dry land to wet.
d.
The rivers run from the high ground to low ground.

B. the rivers run from very wet to dry land

The third answer is correct. Both butane and octane are straight-chain alkenes, so the only relevant variable affecting their melting points is the difference in chain length. Octane is longer so more intermolecular forces (London Forces specifically) arise. Therefore more energy input is required to break these attractions, so the boiling point is higher