Elevated boiling points in alkanes with even number of carbons
There is not really any difference between the boiling points of even and odd carbon alkanes.  For single-chain alkanes the boiling point just goes up as a smooth curve versus chain length.

The melting points do show a small oscillating component with the even chains being higher.  If we imagine the chains in their idealized zig-zag configuration, which would be relatively favorable for the solid state, we find that the even-length chains have a center of inversion which makes them fit better than odd-length ones.  This effect fades, however, with increasing chain length.

Reference:

https://en.wikipedia.org/wiki/Alkane