why would this compound CH3-CH2-CH2-CH2-C)2H have a high boiling point?

Answer 1

The boiling point of a substance depends on the strength of the bonds that hold the molecules together. That molecule is not polar. However, it has a very high number of electrons that will results in strong Van Der Waals forces (or transient dipoles - electrons are free to fluctuate and it can happen that they are found more in one side than another one, resulting in partial charges in the molecules. This repulsion INDUCES a dipole in nearby molecules that therefore "bond" together.)
Van Der Waals are usually quite weak but given the number of atoms you have hence the high number of electrons, the resulting force will be quite strong.
Because of this, more energy (or heat - hence temperature) will be required to disturb this bonds.